About Highland Dancing attire, people in that world would have to inform us, but my impression is that it's constantly evolving.
Yes those 1955 photos look surprisingly modern, with the white 'arasaid" tartans and vests. It appears that Highland Dress attire hasn't changed all that much since then.
This film, from a Highland Games in Scotland in 1950, shows very old-fashioned Highland Dance costumes, the women in jackets, sporrans, plaids, bonnets, etc
https://www.youtube.com/watch?v=cu6e2U3Du_I
This film from a Highland Games in Scotland in 1960 still shows the women wearing sporrans, jackets, and bonnets though the plaids are gone
https://www.youtube.com/watch?v=Cb7yQwf6vLs
I know that recently I've seen the dance tartans get more and more vivid, with almost neon Day-Glo colours.
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