Yep, defintitly K-On school uniforms  Otakus are a good market for Pinky Street 
Raurenu, you're right about the re-use of old parts, it's disappointing. The 1rst girl's boots look a lot like serie 3's, without the laces ...

I hope these aren't the finalized versions--that they make it less like they're reusing old parts.

Here's a better picture!  I loooooooooove the girl on the right and especially her coffee mug and I totally want that cute pink & black dress! 

Thanks Suemomo 
So yes, they all have the same face with different expressions, that's a new idea ... Not sure I can manage to enjoy the 1rst one's mouth  #1 and #2 have the same bangs as well.
Oh well, they're cute, but nothing exciting to me 

I think she's one girl in three different situations. I kinda like that idea. 

I really don't like the faces. The one on the right is pretty cute. I'd be tempted to get her but the others don't interest me much.

Oooh! I love these. They do look like triplets though. 

The girl on the right is definitely the best! Winking + Coffee = Pure Win! 

I only like the one on the right. Accessories that arent bags = lurve. She's the most original looking one so far. The one in the front looks like it's been made from cobbled together and repainted old bits. And what's up with the expression on the right? What's she supposed to be doing?

Woah, the whole having the same face thing is a little creepy. 

I love the middle girl, though! She's adorable. The third girl is also sweet, and I love her outfit. And they come out just in time for my birthday! YAY!