Change AI clothing selection

This is not possible by default, but there exists a mod for this by littlemssam called 'Dress Code | Custom Lot Traits':

This Mod adds six new custom Lot Traits to the Game which lets you customize every Lot what Sims should wear.

When Sims spawn on a Lot where one of the seven Lot Traits (see below) is active, they’ll change into a specific Outfit Category.

The Traits need to be added to the Lot before your Sims will spawn there!
Only use one Trait per Lot!

Dress Code Traits available (works on every Lot):

• Athletic
• Swimwear
• Formal
• Party
• Sleepwear
• Everyday
• Naked Addon