on Nov 25, 2025
Quick Answer: OGL has updated both its built-in bra construction and sizing guidance. Built-In Bra 3.0 introduces a stretchier lining, a wider underband, and seamless heat-bonded construction. Sizing 2.0 updates body-measurement ranges and US-size equivalents. Your previous OGL size may stay the same or change, so use the current chart for the specific product rather than automatically sizing down.
Key Takeaways:
- Built-In Bra 3.0 and Sizing 2.0 are two separate updates.
- The new chart does not mean every woman should choose one size smaller.
- Most updated sizes accommodate higher body measurements than before.
- XL follows a different adjustment pattern from XS through L.
- XXS has been added to Sizing 2.0, while 2XL is not shown.
- Always use the current product page and your latest measurements.
What Is the Difference Between Built-In Bra 3.0 and Sizing 2.0?
These updates address different parts of the fit experience.
Built-In Bra 3.0 describes the inner construction of selected OGL built-in bra tops. It concerns the lining, stretch, underband, and assembly method.
Sizing 2.0 describes how body measurements correspond with letter sizes. It changes the measurement ranges and US-size equivalents used to help customers select a size.
A top can therefore have an updated built-in bra construction and an updated size chart, but the two version numbers should not be treated as the same change.
What Changed in Built-In Bra 3.0?
Built-In Bra 3.0 updates the inner structure rather than simply making the entire garment larger.
| Detail | Built-In Bra 2.0 | Built-In Bra 3.0 |
|---|---|---|
| Lining | Stretch cotton-blend lining | Eco-SkinKiss® lining |
| Fiber content | Varies by product | 92% plant-based viscose and 8% spandex |
| Stretch | Flexible stretch | 15% more stretch |
| Underband | A gentle hug of support | 20% wider underband |
| Construction | Traditional seamed construction | Seamless, heat-bonded construction |
The percentage comparisons need to be read precisely:
- The 15% figure describes increased stretch.
- The 20% figure describes increased underband width.
- Neither percentage describes an increase in overall garment size.
- A 20% wider underband does not mean 20% more support.
Not every OGL built-in bra top has been upgraded. On the individual product page, scroll below “Design Features.” A “Built In. Step Out.” image identifies a 3.0 style; styles without it use the 2.0 construction.
How Has the OGL Size Chart Changed?
Sizing 2.0 revises the body-measurement ranges assigned to each letter size. It is not a universal enlargement applied evenly across every measurement.
For XS through L, both ends of most measurement ranges are higher than before. XL is different: its bust, underbust, and waist ranges are narrower, while its hip range begins and ends at higher measurements.
Bust Measurements
| Size | Sizing 1.0 | Sizing 2.0 |
|---|---|---|
| XXS | Not listed | 31.9–33.5 in |
| XS | 29.5–32.3 in | 33.9–35.4 in |
| S | 32.7–35.4 in | 35.8–37.4 in |
| M | 35.8–38.2 in | 37.8–39.8 in |
| L | 38.6–41.3 in | 40.2–42.1 in |
| XL | 41.7–44.5 in | 42.5–44.1 in |
| 2XL | 44.9–47.6 in | Not listed |
Underbust Measurements
| Size | Sizing 1.0 | Sizing 2.0 |
|---|---|---|
| XXS | Not listed | 25.2–26.8 in |
| XS | 25.6–27.2 in | 27.2–28.7 in |
| S | 27.6–29.1 in | 29.1–30.7 in |
| M | 29.5–31.5 in | 31.1–32.7 in |
| L | 31.9–34.3 in | 33.1–34.6 in |
| XL | 34.6–37.4 in | 35.0–36.6 in |
| 2XL | 37.8–39.4 in | Not listed |
Waist Measurements
| Size | Sizing 1.0 | Sizing 2.0 |
|---|---|---|
| XXS | Not listed | 25.6–27.2 in |
| XS | 22.4–24.4 in | 27.6–29.1 in |
| S | 24.8–27.2 in | 29.5–31.5 in |
| M | 27.6–30.3 in | 31.9–33.5 in |
| L | 31.5–34.3 in | 33.9–35.4 in |
| XL | 35.4–38.2 in | 35.8–37.8 in |
| 2XL | 39.4–42.1 in | Not listed |
Hip Measurements
| Size | Sizing 1.0 | Sizing 2.0 |
|---|---|---|
| XXS | Not listed | 34.6–36.2 in |
| XS | 33.9–35.4 in | 36.6–38.2 in |
| S | 35.8–37.4 in | 38.6–41.3 in |
| M | 37.8–40.2 in | 41.7–44.5 in |
| L | 41.3–44.1 in | 44.9–47.2 in |
| XL | 45.3–48.0 in | 47.6–50.0 in |
| 2XL | 49.2–52.0 in | Not listed |
These figures are body measurements, not the dimensions of the finished garment.
Have the US-Size Equivalents Changed?
Yes. The US-size mapping has also been updated.
| Letter Size | Sizing 1.0 US Size | Sizing 2.0 US Size |
|---|---|---|
| XXS | Not listed | 00 |
| XS | 0 | 0–2 |
| S | 2–4 | 4–6 |
| M | 6–8 | 8–10 |
| L | 10–12 | 12–14 |
| XL | 14–16 | 16 |
| 2XL | 18 | Not listed |
Use these equivalents as orientation rather than as the sole sizing method. A familiar US size does not account for the relationship between your bust, underbust, waist, and hips.
Should You Automatically Size Down in Sizing 2.0?
No. Some women may move down one letter size under the updated chart, while others may remain in the same size.
The examples below show why there is no universal rule:
- A 37-inch bust, 29.9-inch underbust, and 29.9-inch waist changes from M to S.
- A 39.4-inch bust, 32.3-inch underbust, and 33.1-inch waist changes from L to M.
- A 43.3-inch bust, 35.8-inch underbust, and 37-inch waist remains XL.
Sizing 2.0 may result in a smaller letter size for some measurement combinations, but “always size down” would be inaccurate.
How Should You Choose Your Current OGL Size?
Measure Your Body Again
Do not rely only on measurements taken several months ago or on the label of a top that already fits. Use a soft measuring tape and wear a light, unpadded layer where possible.
Compare All Relevant Measurements
For a built-in bra top, begin with the bust and underbust. Then check the waist and hips when the garment extends through those areas or has a fitted lower body.
Use the Product-Specific Chart
Open the current size guide on the product page rather than using a saved chart or previous order. The OGL Size Guide allows customers to compare Previous Fit and Updated Fit information.
Check the Garment Measurements
Body measurements help identify a starting size. Product measurements explain the garment’s actual length and dimensions, which may vary by neckline, fabric, and silhouette.
Do Not Choose by Letter Size Alone
The same letter does not guarantee an identical fit across two differently constructed tops. Stretch, garment length, neckline, and underband design can change how each style wears.
How Should You Measure for an OGL Built-In Bra Top?
- Bust: Measure around the fullest part of the bust and beneath the arms.
- Underbust: Measure around the rib cage directly beneath the bust.
- Waist: Measure around the narrowest part of the natural waist.
- Hips: Measure around the fullest part with your feet together.
Keep the tape level and comfortably close to the body without pulling it tight. Measurements converted from centimeters may differ slightly from whole-inch values shown online because of rounding.
Women can browse the current OGL built-in bra tops, but the size guide on each chosen product should remain the final reference.
What If Your Measurements Fall Across Different Sizes?
Mixed measurements are common. The most relevant measurement depends on where the garment is most structured.
- Prioritize bust and underbust when the inner bra is the main fit concern.
- Include the waist when the top is fitted or designed to be tucked.
- Check hips for bodysuits and longer styles extending below the waist.
- Consider the larger size when firm tension appears across a structured area.
- Contact customer service when two key measurements indicate different sizes.
Stretch can accommodate small differences, but it should not be expected to correct misplaced cups, an underband sitting on breast tissue, or a neckline that gaps substantially.
Final Thoughts
OGL’s Built-In Bra 3.0 and Sizing 2.0 updates should make selection more informed, not more automatic. Built-In Bra 3.0 changes the inner construction of selected styles, while Sizing 2.0 changes how body measurements map to size labels. Measure again, compare every relevant area, and use the current product page instead of assuming your previous letter size will remain the same—or that everyone needs to size down.
FAQ
Does Built-In Bra 3.0 mean the whole top is larger?
No. The update concerns the lining, stretch, underband width, and construction. It does not mean the entire garment is 15% or 20% larger.
Should I order one size smaller under Sizing 2.0?
Not automatically. Some measurement combinations move down one letter size, while others remain unchanged. Compare your current measurements with the new chart.
How can I tell whether an OGL top has Built-In Bra 2.0 or 3.0?
Check below “Design Features” on the product page. The “Built In. Step Out.” image identifies Built-In Bra 3.0; not all styles are upgraded.
Why is my current OGL size different from my previous order?
Sizing 2.0 assigns updated body-measurement ranges and US equivalents to each label. A changed letter may reflect the new chart rather than a body change.
What should I do if my bust and underbust indicate different sizes?
Check the product’s stretch and construction, then avoid a size that places excessive tension on either area. Contact OGL customer service when the difference is unclear.
