In order to transition staff costumes to objects, we must further disentangle staff from regular peeps. This has many advantages, such as making custom entertainers or even handymen costumes. However, this means putting some restrictions on what costumes can be assigned to staff in the mean while.
We are aware of plug-ins allowing staff to be decorated like normal peeps, though, e.g. using @Manticore-007's Peep Editor. Splitting staff from peeps will mean breaking such functionality. We can do our very best to reverting 'invalid' staff to their normal outfits instead of them outright disappearing. However, in the mean time, we should disallow peep costumes from being assigned to staff to prevent further disappointment down the line.
Once we get to actually adding custom staff costumes, I plan to add a new plug-in API to get available costumes for a particular staff type. This would apply to entertainers, but also other staff types. This should make it easier for plug-in authors to tap into custom costumes in the future.
