You could try ebay ? Amazon looks like they may have some outfits. Fancy dress shops too (the higher quality ones).
www.dress4play.co.uk, there was a great Japanese cosplay/uniform site, but i think they closed fairly recently, cosjap ?
http://www.vegaoo.co.uk/adult-costum...?type=category
https://www.amazon.co.uk/s/?ie=UTF8&...l_7q9pmb0e3r_e
Googel "uk fancy dress" , and the usual adult stores stock some nice garments too. Lovehoney.co.uk, Bondara etc
Hope this is of some use to you
