Size 8 feet? for an adult?
Where do you get shoes that small? The Toy Bazaar?
Anyway, I honestly can't remember how much larger my boots are for going over stockingfoot neoprenes. (cos I think they come in e.g. 9/10, 11/12, etc. was it one or two sizes bigger?
I went into the shop with my neoprenes and physically tried them on - as you know there can be a lot of spare neoprene material in your foot area depending on the cut or your actual foot size, the last thing you want is to be uncomfortable when afloat. I might be down your way (cheeky) this weekend, post me your tel number and I'll bring down my boots. That'll give you an idea if you want that style, if so I'll speak to DiverDave and see what I can arrange.
toodle pip
Iain