I am a very experienced seamstress. I liked this pattern but I did make a few modifications. My daughter has a long torso so I added an inch to the torso measurement. I do feel that so many sizes are unnecessary. I wish sizing was similar to the "big name" leotard companies (GK Elite, Alpha Factor, Under Armour). It would seem less confusing to a beginning sewer. I have now made many leotards for my competitive gymnast as well as for many of her friends. They all rave about the good fit. No matter which size I make, I cut the booty a few sizes bigger. The girls seem to like the fit and rarely have to "adjust" the leo down there.