What set is this from, i've seen a few other images that have one or two girls in these outfits.

It appears to be from 揺れるバスガイド ～おっぱいがいっぱい～ by Waffle. If somebody would care to translate the game's name, I'd appreciate it.

"Yureru Bus Guide ~Oppai ga Ippai~"

Roughly translates to: "Swaying Bus Guides ~So much Boobies~"