According to the Westcomb sizing chart, a small jacket would fit an individual with a 99cm chest measurement.
You can find their sizing chart at this link...
http://campsavercontent.campsavercm.netdna-cdn.com/skin/frontend/enter11001/campsaver/manu/sizing/westcomb.html
I looked and tried on the jacket and it had drawstrings on both hips that tighten from the back, but it tighten the whole jacket all the way around. It seemed to tighten tight enough. Thanks!
Thank you for your question.
I'd check the Measurements on the Size Chart we have on our site, Located on the Apoc Jacket Page, under the product. I apologise for not being able to answer more directly from the information provided in your e-mail.
I hope you find this helpful.
You'll receive a picture of the inside of the jacket in a moment. Fit is very similar to the Shift Hoody.
Westcomb is a very athletic cut, I would not recommend them. You could try Sierra Designs.