Depending on the temperature, I think a nice doeskin or flannel wool is more versatile than barathea. It may be too hot for your neighborhood, but I think it also looks more distinctive. In a room full of tuxedoes, the great majority will be barathea ( or "plain weave" or some other term for the same thing) but there was a time when flannel was quite common. Dark barathea tends to look particularly formal, whereas flannel can be more casual without being rustic. You can also get some nice cavalry twills and hopsacks that will add texture without additional color. If you are going to buy the fabric yourself, just be sure to get more than you can possibly use, as there may not be any more if/when you go back... If you are going to let your tailor supply the fabric, ask to see a range of weights and textures.