In reply to Babika & OP:
They do tend to be smaller round the waist, though, which might be an issue for someone needing a men's medium waist? Definitely worth a try, though, as some of the salopettes might go straight up from the roomier bum (particularly the cheaper - but still decent - brands, as one way they cut costs is by less attention to fitting).
Paramo do short leg lengths in some stuff. And take a look at the Needlesports website, they're quite good at stocking different leg lengths and might have clues as to which brands tend to make different lengths.