Thanks everyone for your speedy replies so far!

Miss E, I think I will go shopping on my own and try on heaps of styles, that's good advice. I think I need to prepare myself for a long day!

Traveller, you are right too. Especially at swimming lessons - I suppose the people most likely to understand and not think twice about what swimmers you're wearing are other mums! But, we also live close to the beach and I anticipate spending more and more time there as DS gets older, so I want to feel nice and confident in my swimmers. So I guess I'm thinking so hard about what to buy because I'll also be wearing them around family and friends, not just other mummies at the pool!