The Gentry is a store for guys who like western-style, non-mesh clothes and footwear. Lately the owner, Sheen Revnik, has started to release outfit sets like “City Slicker” which are partially mesh. In this case it's the blazer which comes with an add-on prim collar.
I suggest you teleport over by clicking the store logo on the sidebar and check it out yourselves! And don't forget to take your girlfriend with you: There are lots of clothes for her at The Gentry, too.
( => click picture to enlarge !)
Btw: There's an MM Board over there with a complete outfit on it that just needs 19 more clicks!