craftgrrl | Soutach braid and Pink Cording.

Hi!
I'm currently in the process of working on my Halloween Costume, and I'm getting caught up on some pieces to the ensemble that I don't know..

Does anyone know what a SOUTACH BRAID is?
what it looks like or where I could get one at. I searched ebay and google.
and I found people talking about it but not what it is or where I could get it.

Also I'm looking for some Cording [ Rattail, Middy Braid] that looks like this

but I need Pink. I want it to be silky and of a nice thickness, as it's for a corset.
I did not find any online, just hoping to be pointed in the right direction.