I've a standard one from J. Byous Co. It's very well made (in the USA, not Pakistan) and fits very well (they're made to order, so expect a wait). It compares very favorably with an MoD one that I have, but is a bit lighter, doesn't have a quilted liner, and fits better. I might have to get one of their new "tropical weight" ones; a caubeen's a very warm bonnet to wear in Florida. Mine has one of their green rosettes with a reproduction of the brass harp of Erin of the 69th New York Volunteers; the Irish Brigade.

To each their own, but I personally I don't wear hackles. They're traditionally military and often, like the red hackle of the Black Watch, awarded for conspicuous gallantry in action; it feels rather presumptuous to me to wear such a thing I haven't earned. If I was going to wear one, I suppose I'd wear an Irish tricolor hackle, which is clearly civilian with no regimental association.