[It is quite clear from the look on his face he did not think that through beyond the 'if I were in the bath, I'd be slightly more wet than I am now' and hadn't made it to 'if I were in the bath, I'd be naked in a bath with Rose, who would also be naked'. He sports that look quite impressively for a couple of seconds and then he hides the brief picturing-that-mentally phase carefully under a thoughtful expression.] Used to have an old sort of bathing suit. One of those horrible stripey ones, make you look like an escaped American 1950s convict from a tropical island prison.