I am an adult, and I purchased these tights at my local dance apparel shop.  I am 5'4 and I weigh 120lbs.  I purchased the Lg/XL size because I like to be comfortable, and to be safe.  When I tried them on they were so tight I thought I was going to be ill.  I went to class without tights because I have never been so uncomfortable in a garment in my life.

Please do not buy these tights...I honestly don't believe that even the largest size will fit me.

Two days ago I decided to order the DASKIN Ultrasoft Convertible ballet pink tights. I purchased the C/D size to be safe, and they are comfortable.  I just tried them on and they are a great fit.
<a data-hook="product-link-linked" class="a-link-normal" href="/Danskin-Women-s-Convertible-Tight/dp/B001U88UU8/ref=cm_cr_arp_d_rvw_txt?ie=UTF8">Danskin Women's Convertible Tight</a>