Enter the College Student Disguise.
The jacket will help ward off breezes in the evening on the Quad, or at night when she's running across dormitory rooftops in a desperate hunt for ... something. It's inspired by an image in Dolly Bureau, although apparently that pattern has a hood. I doubt the hood will fit a Pullip's head! I'm considering whether to remove the hood, leave it, or resize it. I'll have to check the pattern to see how easily it modifies.
The t-shirt should be easy. (The Kingdom Hearts key symbol works to make her masterful disguise even more convincing.) As for the jeans, I'll use this guide if I don't find anything better. The trouble may be finding sufficiently thin denim.
I bought Dolly Bureau a couple days ago--it'll arrive on the 7th, and in a week or so I'll be able to start making clothes again.