Chance wore a light grey Champion Heritage All Over Script shirt for his headlining Lollapalooza set. While that color way is not currently available,  the olive version is currently available for pre-order here. You should snag it now, since some sizes are already sold out.

For a similar look, check out this Big C shirt.

Chance also wore his signature hat and Gucci belt.

UPDATE: Shirt now available in white here!