I am deciding between two low-cut vests to accompany my tuxedo, and I'm not sure which has the more appropriate fabric. I recently purchased this RLPL vest on discount. It is made entirely of grosgrain, not just the facing on its lapels. There is also this option from Brooks Brothers, except in black, which is available in my local store. It's made entirely of cotton pique. Obviously, having a vest cut from the same fabric as my suit would be the best option, but this is not possible. Which is a better option for pairing with my tux: the grosgrain or pique version? My shirt has a pique front, and the lapel facings are grosgrain. The grosgrain on the vest does not perfectly match the facings, but it's very close. Also, stylistically they are very similar, with two small differences. The RLPL is a four button, while the BB is a more traditional three. The extra button doesn't really change the look, though. Also, the lapels of the RLPL are rounded at the bottom, while the BB are squared off. I wouldn't think either of these differences would really matter, but does anyone know if one style is more appropriate for black tie than the other? Price and fit for both is about the same for me. Any thoughts on which to go with?