Once you have several strips soldered up, you can arrange them on your cap. A foam head is very handy for this!
Use pins to tack on the strips in your desired arrangement.
When you're happy with your design, use more wires to connect the strips in a U-turn.
Adding additional power and ground connections is prudent for long runs of NeoPixels, and we think these extra white wires look nice in the design, too:
Solder the data input to pin 6 on FLORA, all power wires to VBATT, and all ground wires to GND.
Test that all your NeoPixels work using the library's sample code! If they don't all come on, double check your pixels' data arrows and that you don't have any short circuits.
When they're all working, it's time to sew them in place! Use clear or color-coordinating thread to stitch just before and just after each pixel, knotting off at each one for the most durable construction.