Our sizing is designed with tweens in mind. We know that kids grow at their own pace, so our collection is sold as individual pieces, allowing you to mix and match for the ideal fit. Plus, with our 'in-between' sizes specifically for tweens, you can always find the perfect fit, ensuring your child feels comfortable and confident. Sizes are roughly based on kids' ages. You can use this chart to help find their best fit based on their measurements. Garment measurements are also found on each product page.