I'm a size 8-10 and the S size fits me perfectly, and allows for a T-Shirt underneath. The jacket is lovely and the colour is perfect !
The product is exactly what i was looking for A++

This an utterly gorgeous piece of clothing, lovely material and feels very nice to wear.

The only warning is, I'm not very tall, I'm 5'4'' and it's nice fit even though I thought it would be a bit longer. So I have the biggest size which is Large. So if you are quite a bit taller than me then the top might look rather short on you, unless you don't mind.

I just hope it doesn't shrink in the wash.

I love this but whatever size you are i recommend getting the next size down as Bench clothes are usually a bit bigger. I'm an 8 And had to return the size S and get the XS and it fits me fine =]