I'm trying to help someone with a Penguin costume and he is having trouble getting a pair of spats. Are there any good places to get them? I don't know how the sizes run, but he is kind of a bigger guy.
If you don't want to purchase online, try local Halloween stores, or tuxedo suppliers.
They're also extremely easy to make. You can use the bottom part of a cheesy Halloween boot cover pattern, like for a pirate or superhero costume as a place to start.