So... which plaid is which?

[EagleJCS]

No, they are different garments. As has been said, a piper's plaid is worn across the body and nowadays often has the folds sewn in. A drummer's plaid is ties at the waist under the doublet and fastened at the shoulder. Here you can see both



The drummer's plaid is refinement of the early 19th century style that replicated the old belted plaid but was a separate garment to the kilt. I think it was simply referred to a a plaid at the time but for clarity, is something I refer to as a Half Plaid. Here is the outfit worn by Donald Munro Ross c.1820 comprising a kilt, jacket and (half) plaid.

I stand corrected. Thank you.