In S06E12 Homer the Great (2F09), a childhood acquaintance (clearly not a childhood friend...) of Homer's wears a shirt with a logo comprised of two footprints:
The same logo is seen on a shirt worn by Homer as a teenager in S07E24 Homerpalooza (3F21):
I'm not aware of any apparel brands it could be directly referencing - or making a parody of. Any ideas?