Recommendation from the B4D Forum:

Verdurao has Brasilia-themed t-shirts with cheeky sayings and drawings, such as the iconic "I Heart NYC"-style shirt, only with a pink ipê tree in place of the heart.

It is on the street side of Infinu, an art collective selling high-end craft and home decorative items.
There is also a nice little coffee shop and a gelato place, and a tattoo parlor inside.