Alpinestars Sizing

For those of you that have alpinestars jackets, how does their sizing (s, m, l, etc...) compare to measuring by inches? I'm about a 36-38 and I just want to make sure that a "small" isn't a 42 or anything. Thanks in advance.

BTW, the jacket I'm looking at is the "alloy" jacket. Has anyone heard anything positive or negative about it? Thanks again