I have heard great things about Koi and am about to try them for myself, but have a question. Do the 100% cotton tops shrink with laundering or are they pre-shrunk? I am using their size chart to determine size to order, as several of you have commented that you wear a larger size in Koi (probably due to junior sizing), but didn't know if I need to allow for shrinkage. I am so excited to get and wear my Koi scrubs and don't want to have to exchange them for size or pay for additional shipping to send them back. Any help that you can provide, would be greatly appreciated!!