You can find costumes pretty much any dance website. I suggest Curtain Call. They have a wide variety of styles. https://curtaincallcostumes.com/about-us.php
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ballet is about expressing feeling through movement, music and costumes.
Ebay.com has a rather large selection of ballet costumes in all sizes. http://www.ebay.com/sch/i.html?_nkw=ballet+costumes&_frs=1&_trksid=p3286.c0.m359
There are all sorts of different costumes; From Animal costumes, to ballet costumes. So the costumes vary, depending on who was on the stage at times.
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Usually ballet dancers wear a body suit with a skirt or tutu, or a dress always with tights inculded and ballet slippers