I really like that shirt you are wearing in your avatar picture; may I enquire as to who made it? And is it a cutaway? Jon.
It's a Jatnzen shirt. It's the same fabric as in Nick M's second shirt on the first page of this thread.
It has a sharkfin collar as pictured in the Joseph model on Jantzen's 'Latest shirt styles' page. It's my favorite casual shirt. Slim fitting, looks good w/o a tie and has gone through nearly 100 washes. I had to refasten a few buttons on it last week but it's still going strong. B Addition re buttons. MOP is from Oyster shells (hence the MOP name), trocas and others come from other shells. There is a (fuzzy) picture on the Jantzen site that shows the shells.