The number of strips you have will be determined by how many boning pockets your corset has. Mine has 11 strips total - one for each of the 12 spines except the inside front closure spine.
You'll solder the Circuit Playground G to the NeoPixel G, VBAT to +, and A1 to DI. Be sure you're soldering to the correct end of the strips -- if you solder to D0 they won't work. Power can flow either way, but data must flow in the direction of the arrows.
We'll add the power switch and battery halfway through the series of strips, so it will end up at the back of the corset and be better able to power all the strips.