Things stores with actually good store managers have to create team spirit and more opportunities for customer connections.

My shitty store has never once done a dress up day, but they were common at my previous store (which I only left due to relocating for grad school).

You ever have a spirit week in high school? It's like that. Twin days, superhero days, sports days, favorite color days, etc. you dress in that theme (following dress code as much as you can of course- no Spandex for superhero day but, rather, a superhero shirt or hat)