I made my Clap with 2 balls (actually just under, cuz I did a swatch and had a tiny simdge leftover,) of SWTC Bamboo on size 6 needles. It finished smaller than most others, at 16"w by 48-50" long. It's soooo drapey it was kinda hard to measure. I followed the pattern exactly (except I slipped my first sts purlwise on the increase section.) I'm pleased as punch with the outcome, and I just have to decide what to do with my 2 leftover balls (I got plenty to cover my ass.)
I was planning on a smaller wrap, I noticed how large some here finished out to be, and I wanted something not so huge. I suppose if you do 2 in black you could buy a "third" ball to split between 2, to make them both a little bigger. Go Clappers! I love this thing! LOL (OK, so I am a doofus!