A few theories:
1) It was a coincidence. The model wore the boots and then damn...this polar bear just walked by and you know, they had to skin it. It just went with the boots, like, so freaking well.
2) One of the prop guys has this screenplay? About the Abominable Snowman? Only, get this, it's a gorgeous woman...but only at night! It's gonna be awesome! Wanna read it? No?
3) It was either this or wearing the moose head. And her contract specifically says no moose heads.