Years ago I made leotards for my daughter and her friend with a "Stretch and Sew" pattern. My granddaughter is now in gymnastics and I don't have the pattern, but make one up with her measurements and tracing the outline of one in a store. They are super easy to make - it's 2 pieces (front and back), shoulder seams, crotch seam and elastic at all the openings. You can sometimes find them online for sale for as little as $12 and I don't mind paying that, but the $40-45 in the gym is too much. You have to save money for when they go into competitive gymnastics and have to buy the team leotards and pants and jacket - that's really expensive.