Originally Posted by hellohello123
1. wondering what the typical length of Men's XS shirts are
It varies widely. Very widely.
if a XS jumper of the same brand (e.g Lonsdale) has the same length and width as a shirt of the same brand (Lonsdale)
I guess it's not impossible that they'd be the same length and width, but I definitely wouldn't assume this.
2. what height are men's XS shirts targeted towards?
Seriously, it varies. You have to try it on and decide.
If you can't try it on, don't buy. Or only buy if there's a really easy and inexpensive return policy in place.
If you can try it on, and do try it on, and you're still not sure, it's 95% certain that it's too short. But hey, post pictures here let other people tell you that it's too short.