Making a loincloth at home isn't hard and frankly requires zero skill.
The method I use is just a belt and a strip of material between the legs.
NoKey: That thing does look kinda cool. Looks like basically a thong or a speedo, with extra flaps on it.
Jon: I wouldn't say zero skill, but for the kinds I wear, it is pretty low, with no sewing required. You need less than 2 yards/meters of cloth for a simple breechcloth held up by a belt, and at least 3 for a 1-piece loincloth you tie around yourself. Cut it about 10-16 inches/25-40 cm wide, and you're good.
Well, just some measuring and cutting.
There's also the "half" style, just an apron held up by belt in front. Not seen much anymore, but there was a Lakota tiospaye (extended family) named after it.