A pool? Well Ok, there isn't one. But the important point is that if there were a pool then you could use it with confidence. So the costume must be for the Sunday then. In which case & in my case definitely not a swimming costume.
Second hand Sue? Is that the same as Runaround Sue? Actually is that the same as two quid Sue? - I remember a stall selling dressing-up-clothes at £2 an item. I was in heaven...

Kris