I bought it for when I'm walking and didn't want to be weighed down with a coat so I didn't expect it to be glamorous, but this was so big you could have put two of me in it, ok half of me again. I checked the size guide and opted for large based on my normal clothes size of 16, if their sizing was different they should have provided their own size guide. After contacting the company who asked me to include a note with my chest measurement, I returned the item. About a week later they phoned me to check I would be happy with a medium and a different colour (the girl on the other end of the phone didn't sound like she cared very much), I agreed to the choice, but I'm still not sure re the size. I'm still waiting for the replacement to arrive. From original order to present it's getting on for three weeks and counting!