Jeans

Carhartt jeans should fit you, go to their London Fields outlet store, prices start around £10-£15 and mine have lasted for ages. As for the worn out crotch, get a patch sewn in for around £5 at any tailor.

@ Chainbraker - my tailor will re-weave your denims in the crotch region. His work is good and they look as good as new. He can even undertake gusset-strengthening work too. PM me and I'll sort you out.
Both of these seem like great ideas!!! I get to keep my Old New jeans and buy fresh ones.