It looks to me like a double whammy... /ik on with the m3 character... The pose applied to the clothes, prior to conforming. also, different body morphs to the clothes and body. I've also seen similar if you have ik on and grab the wrong part for scaling...I've had the part go in every direction.

Humankind has not woven the web of life. We are but one thread within it.
Whatever we do to the web, we do to ourselves. All things are bound together.
All things connect......Chief Seattle, 1854