Re: Sims restaurant glitch
No, that's not normal... unless you have the 'Eco Lifestyle' expansion pack and have the 'clothing optional' lot trait on the restaurant - I see it's possible to add that trait to a restaurant (see screenshot) ...(more info about Eco Lifestyle: https://www.carls-sims-4-guide.com/expansionpacks/ecolifestyle/neighborhood-action-plans.php).
Do you have Mods or CC? Please try removing them and the cache file to see if the issue remains when you re-enter the game. Don't save the game with them removed, just go in the game and see if the issue is still there. If the issue's gone, you can exit without saving, then start testing to see which Mod/CC is causing the issue. Directions for this are in the spoiler tag below:
Current list of Mods that are known to be broken:
https://answers.ea.com/t5/Game-and-Mod-CC-Issues/Compiled-List-of-Outdated-Mod-Issues/m-p/11686804#M21231