Browse away my dear!
As for patterns, JoAnn's (or other craft stores) typically have a 'Halloween' pattern that has your basic maid pattern. The top is a little ... non ideal in my opinion, so it's best to kind of combine and make some hybrid patterns here.
There's a lot of maid characters out there, I'm sure you'll find something.
Ahhh, one big tip though - if you're looking to do something like Sakura from Tsubasa, her maid outfit, do take care to make sure you don't end up looking like a pilgrim. I threw that thing out as soon as I realized I looked like I belonged in a Thanksgiving re-enactment...
Oh yeah, apron pattern - I ended up making my own, but I'M SURE
there's also a pattern out there for that.