Clothes shopping
The GTA 6 Ultimate Edition adds the Stock 305 Clothing Store in Stockyard, and VICE reports that some clothing stores carry items other locations don't.

“Stockyard's premier destination for elevated streetwear”
The Ultimate Edition's Stock 305 Clothing Store offers unique and exclusive looks for Jason and Lucia at what Rockstar calls Stockyard's premier destination for elevated streetwear. The PlayStation Store lists it among the Ultimate Edition's special destinations, which are only open for business with that edition.
VICE's Oct. 7 summary of IGN's interview with Rob Nelson, co-studio head at Rockstar North, says some clothing stores and salons carry items and hairstyles that other locations don't, and that a personal vehicle's trunk can hold spare outfits and weapons.