Its doesnt really matter but most gymnastics leotards go to the neck so that when we move around it doesnt slip down. It will probably be fine because she wont be learning hard skills in the beginning. Most gymnastics leotards cost 32 dollars or so. ...
you should wear either a thong or "second skin" type underwear. some people prefer not to wear anything under it, but its not a very good idea when its that time of the month : /
I started my 4 year old in gymnastics a few months ago. The gymnastics leotards and unitards seem to have a stronger durability with bold designs. The dance leotards that I bought her when she took dance were more thin and quite plain. Not very many ...