Summer All The Time Collection

The Summer All The Time Collection was produced by amateur fashion designers Phineas and Ferb. Gaston Le Mode appropriated the designs to use in his fashion show. ("Run Away Runway") The clothes were modeled after what Phineas and Ferb wear in most episodes. Candace was asked to wear it, but she refused due to Phineas and Ferb's influence in making it.

In Phineas and Ferb's Christmas Vacation, Irving gets a copy of Phineas and Ferb's clothes which is most likely this collection.

Phineas and Ferb buy this collection from the Super Duper Megastore in ("Ain't No Kiddie Ride"), and in ("Phineas and Ferb: Summer Belongs To You!"), Clay Aiken and Chaka Khan's animated selves are seen wearing it.