I have been looking for a black, low-cut formal vest like the kind Pierce Brosnan wears in his role as James Bond. Â This past weekend, I came across a great shawl-collared vest that fits the bill perfectly. Â The only potential sticking point is that the vest's collar is satin, while my tuxedo's lapel is grosgrain. Â Would it be a fashion faux pas to mix satin with grosgrain? Â If so, would it be an easy task for a tailor to reface the collar in grosgrain? Â Your thoughts are appreciated.