The skin in wiki is quite old and not up-to-date. If the ID is above 100, the skin name's ID listed in wiki is 1 lesser than the real skin ID. Example: if the skin ID in server is 122, the skin name & its picture in wiki could be 121.
Btw, you could have used /buyskin <skin id> to see/try the skin before purchasing it via /buyskin <skin id> <confirm>