yes there are big differences in sizes but as far as my experience goes its never wrong to size up but mostly wrong to size down.
especially for trousers.
i am 6'4" and i wear trousers from size 2 (older stuff) to size 4.
i like the huge oversize fit. so size 4 is normaly the way to go.
which season are the one you selling now? i love the cut, wish i had money to buy them.
survival uniform... vintage 50's french chore jacket, issey pressed shirt, THE y's trousers(been wearing them almost everyday for the past 4 weeks), nike.
bonus proper fit of ex-jacket of mine. aw99...
coogles photo. (Click to show)