My daughter has worn Trimfit for many years and always buys from a closed workwear store. We found them to be very small. She averages 11 years old and is a size 10-14 (which I think is a problem, kids aged 10 and 14 are too different) and they were very tight.
Amazon Essentials Little Short Sleeve Leotard Girls' Clothing for Active
61 Review
Tommy Hilfiger Girls Crop White Girls' Clothing
54 Review
C9 Champion Girls Supersoft Bright Girls' Clothing and Active
46 Review
Hollhoff Gymnastics Playgrounds Shorts - Breathable Clothing for Girls
48 Review