About the word "costume", it appears to have undergone a fairly recent semantic shift.
Seems that nowadays it's sort of the equivalent of what's called "fancy dress" in Britain.
But throughout the 19th century and much of the 20th century it simply meant "outfits in a particular style of clothing".
I have a collection of vintage Highland Dress catalogues from around 1900 up to around 1960 and they routinely call Highland Dress "Highland costume". The well-known 19th century history of Highland Dress is called "Costume of the Clans".

By the way the same catalogues, all from Scottish firms and all printed in Scotland, routinely use the word "vest" rather than "waistcoat". Seems that "vest" has also undergone a fairly recent (post-WWII) semantic shift in Britain.
Last edited by OC Richard; 5th July 24 at 02:35 AM.
Proud Mountaineer from the Highlands of West Virginia; son of the Revolution and Civil War; first Europeans on the Guyandotte
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