Getting a mesh from UNPBO armor then use it at unp armor

[yohei123]

Guys, I would like to get the bottom of fundoshi from crential swimsuit which is a UNPBO(Oppai) type of body and would like to place on a UNP type of body which is Blades bikini amor by nisetanaka . I need some help to get the fundoshi bottom to Blades bikini amor and i've tried editing it on outfit studio but after done editing and merging it with the body it causes my game to crash after equipping the body i've edited. i would be thankful if you could help me use the fundoshi on that body the race that i'm using is lovergirl race which is a mod race. I've also attached the NIF below for some helpful reference.

 

 

Fundoshi.nif

Blades bikini top.nif