I'm 5'7, 143 lbs with a 36" chest and 31.5" waist, what size should I get: Size S or M?

I've read how people of similar size have gone with both S and M. I'm wondering if the S would be too fitting (limiting the number of layering).

On the flip side, would a M be too loose/baggy?

Hahah, thanks guys! I ordered the Medium in carbon, so from your responses I'm sure it'll be a good decision. Dan, I really can't wait for it to arrive hehe. I live in Toronto, Canada so unfortunately I won't be getting my hands on it for another week...but on the other hand, it's only a week until I get my welder :D It's been pretty windy and rainy so I know it'll be put to good use once I get it!

Pro, Go with the Medium. I am 5'7" and 150 lbs with a 38 chest and bought both medium and small to judge what fit better. The small fit snugly with only a long sleeve thin Under Armour shirt on but there was NO room for layering if needed. The medium fit well with or without a layer underneath. I ended up returning the small. Hope that this helps.

I would go with a medium for layering purposes. A small on someone your size would probably fit perfect but if you went to throwin on a baselayer with a midweight under it for really cold temps you'd prolly be walking around like your clothing was made out of recylced cardboard...a lil stiff in other words. However, like they always say, "what ever floats your boat!" hehe, just noticed who I was giving this answer to just before I was going to submit it. I guess it couldn't hurt to leave the answer in case someone else is wondering the same thing. PRO2989669, congrats on your new Shift Welder I saw you patiently drool over for days. You got a great bargain over at SAC. Has it arrived yet?