First of all, it is lycra.... but whatever...
Secondly, there is good reason most bibs are in black. Without even considering the sharing your wares perspective, light colors easily are discolored in the ass region from all the road grime that gets ground in from sitting on the saddle.
My question to you--- do you like riding 80 miles on your fixed gear wearing jeans? Your ass must look like a pizza. How well does your cotton wick your sweat away? Like your padded cut-off Dickies on your rock-hard Brooks? Just asking.... Just saying lycra has its place.
But that place is not walking around the grocery store or hanging out at the coffee shop.