For me it would be a benefit to wear sunglasses at the table so other players have less chance of reading my tells... Some opponents have told me that they can tell when I hit a good hand by looking at my eyes... Wearing sunglasses would definitely help me win more money from my monster hands as opponents would not be able to look at my eyes and would have to look for other tells... Sunglasses along with a long sleeve shirt would help me hide my tells...The downside to wearing sunglasses is that one cannot see the opponents as clearly as without sunglasses... Nevertheless, the benefits of wearing sunglasses outweigh the downsides for me...
I never played live, but I would wear sunglasses, better yet, mirrored ones. Another thing would be a turtleneck shirt, because my heart rate always increases in a good move.