Anyone know how generous Jaeger men's wool jumpers are?

[ShmooBooMoo]

Don't know whether to get medium or large. Guy on site wears a medium but it looks skimpy... Any one have any experience of their men's knitwear size-wise? Returns aren't free so want to be sure. Thanks!

[MoonlightandMusic]

If it helps DH is a stocky 5'8" and a Jaeger medium in jumpers fits him perfectly.

[Bejazzled]

DH is a 16.5 in a collar and 42 chest, he gets a Large.