I'm familiar with this style of headgear, and I hear tell they're quite comfortable. I do tend to think, though, that it may not look quite right with a crest badge (even once the playing card is put into play). The outer edge of these hats is very pronounced, and the material is very thin and flexible... those two qualities often times don't lend themselves to either supporting a badge, or achieving the proper "look", once the hat is worn. That said, you certainly wouldn't need a cockade to wear a crest badge, providing you used some other method to stiffen the bonnet. Just my two cents.