I bought the "RED Chain Zipper Pocket 5 Button Slim Vest Waistcoat" in large (US M) along with a few other things and it is great! There are so many reasons to buy from this site.
1.) Everything looks amazing.
2.) The prices are so low.
3.) The clothes fit perfectly.
4.) The fabric feels nice, not cheap at all.
I'm 5ft 6in and 120lb so I just used the size chart to find the right size for me. If you are not sure if you want to buy from this site wonder no more it is a great buy!
If you have any questions just ask.