Wouldn’t you just put it through the xray and then the TSA will pull you aside if needed?

Is this jacket or a shirt/dress? If it’s a jacket, You can take it off and put it through x-rays. If it’s a shirt/dress, I’m not sure of the consequences of walking through security naked or in your underwear…

I haven’t been to an airport with in years where only one person at a time can unload their stuff into the x-ray machine, usually they have spots for five or six persons.

This is not an issue:

I’ve done ziplock bags for cargo short contents before, speeds security checks up a lot.