This thread is for asking any questions that might seem obvious, tangential, silly or what-have-you. Don't be shy, everyone has holes in their knowledge, though the fewer and the smaller we can make them, the better.
Please be respectful of other people's admitting ignorance and don't mock them for it, as they're doing a noble thing.
To any future monthly posters of SQ threads, please remember to add the "stupid_questions" tag.
Collect more evidence.
If possible, find a person who never heard about the supposed properties of the clothes, and ask them to describe them to you. If they can't, maybe they are stupid, but then find another one and... uhm, if everyone who didn't hear about the supposed properties of the clothes is stupid, that's suspicious.
Unexpectedly invite a few painters, put them in different corners of the room, and ask them to paint you in the clothes.
Alternatively, test your ministers. First, meet them with the clothes; next, without them. If they see the clothes both times...
Put the clothes in a bag. Add a few empty bags. Ask your ministers which bag contains the clothes. If all of them failed, ask the tailors.