Hyde is wearing an "Alabama" t-shirt. The band was unknown at the time and definitely did not have merchandise for sale. Alabama signed their record deal in 1980, with RCA, and was well known throughout the '80s.
When Fez is sitting on top of the washing machine in the Formans' basement, there are bottles of "Rit" fabric dye on the shelf behind him. The labels are from the early 2000s.