Not at all... Try the Flying clothing store at RNAS Culdrose (not sure of the number but it will be on t'interweb) as they have loads....
Having wrote that I then re-read your post.... why do you need to "order" your flying suit / Boots....why not just go over and get a pair..? are you 7' tall with size 23 boots....? If you are then I can see why it is difficult to get you kit but if you are an average size then just nip over and swop your old kit for some new kit...