kinetic saidSome burlap and some good scissors and yr in business!
BURLAP? He's wrapping his fruit, not potatoes!
Chiffon for me, please, but a woven cotton or linen works fine for the proper drape, the cloth just heavy enough not to be transparent (unless it's one of THOSE parties). New fabric may need an initial washing to get any sizing out to make it less stiff. Knit fabric will look bulky and tend to stretch, and be harder to hold up unless the belt method is used.
I might argue semantically that a true loincloth is just a waist wrap no longer than knee length, and does not pass between the legs, as a breechclout does. But these terms have become very loose, and loincloth can now mean almost anything wrapped around the hips.
GQ's second way sounds a bit like a Hindu Dhoti, though I've never been good at visualizing written directions.
I'll likely be wearing the Scottish version of the loincloth, the kilt, for Halloween. And it'll be traditional with no underwear.