Fortunately, not as gross as the subject line implies. Unfortunately, not as interesting either 
My 2.5 year old dd is getting close to being potty trained :)
She has a book about the potty, and at the end there is a page with all kinds of underwear on it. Dd has really taken to these ones with little fish on them and at the end of the book she always points them out. When I say "when you use the potty every time, you'll get to wear knickers!" she says "with fishies on them!" So I'd love to surprise her with her own pair of big girl knickers with fishies on them.
I have looked everywhere I can think of, and I've had no luck. I googled and found some Nemo ones, but they're out of stock / discontinued, and I've found these, which would be perfect, but when I've tried to order them my order won't go through. I've written to their customer service email but I'm looking for a backup plan.
Has anyone seen fish themed kids' underwear anywhere, lately? Can anyone think of some character other than Nemo that would fit the bill or fool a two year old , or some search terms for google that might bring results other than those I get with 'toddler girl underwear fish'?
Thank you :)