Bench raw, bench shirts are like Synthol in bodybuilding, fucking retarded.
i know where you're coming from (synthol is fake muscle, the shirt adds to the lift), but it's not quite right. think of it more like a curved hockey stick or carefully engineered running shoes. football pads/gloves/stickum, or that one-piece swimsuit that was engineered in the 1980s with a lubricant to make that girl in the olympics swim a lot faster.
in addition, these are legal, unlike synthol. you don't get penalized for wearing one, they're par for the course. also, and you'll just have to trust me on this, although a shirt or a suit lets you lift more, it's a hell of a lot harder.