The method my husband has used for 50 years is...
get a wooden men's suit hanger,the kind with the dowell that clips into the wire loop. Replace that short dowell with a loooong dowell, slide the hanging loops over the dowell and stretch the waist to hang naturally. He has never has a problem with the weight distoring the kilt, and until a few weeks ago, his were all tanks. He can also hang a jacket on the same hanger.