Do I have this belted plaid concept correct?

I've been interested in the leine for several years, and am planning to make one one of these days.
From reading Matt Newsome's articles at Albanach.org, I have the impression the belted plaid was used a bit like an overcoat, and the leine was used as the clothing. That is, the plaid could be removed and the lein worn without being thought of as running around in one's underclothes.

"The Early Kilt"


"The Leine"


Matt Newsome cites H. F. McClintock's, Old Irish and Highland Dress, as the source for the majority of information in both articles.

Thank you.