SNSD's 'You Think' Harnesses
He was on Instagram and found the harnesses that SNSD members wore in their "You Think" MV. They are from a Korean brand called Demande de Mutation. I'm almost certain the harnesses were custom made for Girls' Generation since their online shop doesn't carry any.
Demande de Mutation seems to also have some sort of partnership with 4Minute, SISTAR, and EXID as those groups repeatedly appeared on their Instagram. In fact, the harness that SISTAR's Bora wore in her group's "Shake It" MV is made by this brand.
See Also:
Kpop Fashion Trend: Harnesses
4Minute for 'High Cut'
SISTAR's 'Shake It'
٩(๑˃ᴗ˂)و Shelley
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Image Credits: SM Entertainment, instagram.com/demandedemutation