Originally Posted by umonku
My experience is that the Bedford sizing is quite variable from season-to-season and sometimes even within seasons from fabric-to-fabric. I usually wear a size M in EG and have had Bedfords in both size M and size L. I realize that doesn't help you much, but, assuming you can't try the piece on, it is probably best to get measurements for the particular model you are looking to purchase.
Too many words about sizing for EG in general below:
Sizing advice is tough with EG because 'fit' is relative to how you handle the signature triangular cut most jackets have (narrow shoulders/chest + looser at the bottom). IME there are two camps of EG fans (neither is right/wrong, they just have different preference). The first group is people that prefer a slimmer, cropped, dandy-ish fit which minimizes the triangular shape. That usually involves buying the smallest size they can fit into/sizing down. On the other side is people that prefer the looser look. I fall into this camp, and as a result my opinion of EG items is that they are TTS or you should size up if between size. I'm a Small or Medium depending on the brand and I buy all my EG in Medium. The result is that all of my jackets and shirts fit dead on in the shoulders, are a bit loose in the chest, and have a pronounced triangle shape when viewed from the side.