I just got this field jacket in navy:
This is made by TCNY which is a subsidiary of Ascot Chang. I'm a 38R in suits and I got a medium. It's a very light jacket that's pretty slim cut and I wouldn't wear anything more than a shirt or t-shirt underneath - maybe with a very thin jumper/cardigan but that's pushing it. The fit is good - no excess material but not tight. The only quibble I have is the sleeve length. When I enquired about this jacket, TCNY advised me that some customers find the sleeves too short and offered to lengthen the sleeves for me. I had them lengthen the sleeves by half an inch. I think this is just about right although if I was doing it again, I would have gone a full inch longer on the sleeves. Nonetheless, I think I will be getting a lot of wear out of this over the coming years and TCNY were a pleasure to deal with. Their online retail is not up and running yet so you can email them to order.
The jacket cost about $150 with another $15 for alterations