I’m on Steam Windows version 0.6.1 (on Windows 11), no mods installed, I don’t think the rest is necessary.
The operator’s outfit resets automatically as soon as a business opens, even if they are set to management only, or have no work uniform assigned. For example, if my Zoi is working out and a business opens, they’ll change clothes mid-exercise (switching to a uniform if one is set, or just their everyday clothes otherwise), even if they aren’t even supposed to be working there.