I tested the ways mentioned above when I was adding options to the CEP tailoring scripts but in the end it was too little gain for the amount of work.
Something that just came to mind, maybe try a "Play Animation" from the "Other Actions" tab in the conversation after a clothing change. Something minor like salute or bow. Of course, if it works, you'll have to make that change conversation-wide.
I'll test it out when I get some free time but I'm working on another project right now.
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