This is Alex's find but since he's busy with school, I'm posting for him :)
 

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

Do not take without proper credit!
Image Credits: SM Entertainment, instagram.com/demandedemutation
SISTAR is back with their title song, "Shake It"! Their MV is so colorful including the sets and especially the costumes. Here are a few K-pop fashion finds from it:

In the dancing box location, Dasom is wearing the 'Derby' sequin sweatshirt from Filles à papa and Disco Shorts in red from American Apparel.

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