No, Pretty much all armour is made the one size, with the exception of some clone armour I believe...
Having said that, there are some makes of armour that suit other people better, especially in TK armour. The SC Scout armour someone mentioned earlier, is one size fits all. So unless you are HUGE or Really small, you should not have a problem. I have never read about too much difference in the various Biker Armour, size wise, with one exception being a "Mystery MG armour", which looks really wide... There are some comparisons here -
ARMOUR TYPES COMPARISON
I'm a bit wide around the gut, and there are a couple of bikers in the garrison that are a little short and large (Come on, you know who you are!)
I have SC armour, with a KS helmet. It fits me fine.
What sort of body size are you, anything out of the ordinary?
Most of the "Adjustments" you need to make in Biker Scout gear in regards to your size, is in the Cummerbund and pouches. Regardless of how big or small you are, you need to have them "In Proportion".