US does not provide PJs in United First Suite. You'll find PJs on other airlines such as CX and SQ which also has a flat bed in their F cabins. If I am sitting in First where there is a flad bed, then I usually change into sweat pants or at least change my shirt--wear a loose fitting t-shirt to get comfortable and stretch out; this is depending on the route--I only do this on the long-haul pacific routes. I don't know about ladies changing into a night gown with robes, etc. This might be a bit too much.