It's called Fat Mandi, which is based on a comic character she created. The shirts are great for “horizontal running or just bludging on the couch” (her words).
Image may be NSFW.
Clik here to view.
Image may be NSFW.
Clik here to view.
Which brings us here:
Image may be NSFW.
Clik here to view.
There are two shirt options. Cupcake boobs:
Image may be NSFW.
Clik here to view.