Training Bra Size Chart
Multi-column
Boys Underwear size chart

Age | Chest (in) | Chest (cm) | Underbust (in) | Underbust (cm) |
---|---|---|---|---|
8–10 y | 27-29 | 69-74 | 24-25 | 61–64 |
10–12 y | 29-31 | 74-79 | 25-27 | 64–69 |
12–14 y | 31.5-33.5 | 80-85 | 27-29 | 69–74 |
14–16 y | 33.5-34 | 85-86 | 29-31 | 74–79 |
Get the Perfect Fit with Our Size Chart
Using the correct size chart is essential for ensuring your child's comfort and mobility. A proper fit enhances movement and prevents discomfort during play or everyday activities. Different brands may have varying size charts, so always refer to Plan B's specific size guide for the most accurate fit before purchasing. Our training bra collection offers gentle support and comfort for growing girls.
How to Measure for Training Bra
To measure for training bra, use a soft measuring tape and follow these steps:
- Relaxed Underbust: Measure around the ribcage, just below the bust, without tightening the tape
- Fit Underbust: Measure around the ribcage, ensuring the tape is snug and comfortable
- Relaxed Overbust: Measure around the fullest part of the chest, without pulling the tape too tight
- Fit Overbust: Measure around the fullest part of the chest, ensuring the tape fits comfortably but not loosely
Use these measurements with the size chart for a training bra to find the perfect fit for ages 8-10 up to 14-16. Explore our complete sizing collection with our preteen girls underwear size chart and padded underwear size chart for comprehensive sizing guidance.
Tips for the Perfect Fit
Getting the right training bra fit is crucial for comfort and confidence:
- Size up when between sizes: Opt for the larger size if your child is between sizes to accommodate growth spurts, which are common during early adolescence
- Choose flexible fabrics: Consider fabric stretch, materials like cotton-spandex blends offer flexibility and comfort as your child grows
- Check strap features: Ensure strap adjustability. The straps should be neither too tight nor too loose for optimal support
- Use our size chart: Always refer to the size chart for training bra when making a decision to ensure the best fit
Training Bra FAQs
What size is 28 in a training bra?
Size 28 typically refers to the underbust measurement in inches and usually corresponds to an XS or Small in Plan B training bras. Always check our specific training bra size chart for the most accurate size conversion.
Can I use the same size chart for training bras for different brands?
No, each brand has its own sizing standards. Plan B's training bra size chart is designed specifically for our products and may differ from other brands' measurements.
How to measure bra size for beginners?
Start by measuring the underbust snugly, then measure around the fullest part of the chest. Use these measurements with Plan B's training bra size chart to find the right size for first-time bra wearers.
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