My costume will focus on long light up nails. It basically includes a set of ten long nails. It works with many Halloween sets such as vampires, ghouls, mummies. etc. It’s intent is to scare people and add interest to a normal scary Halloween set.
Process:

Use Band-Aid Waterproof Tape to make ten finger cots.

Wire ten LEDs in series-in progress
Tinkercad circuit:
https://www.tinkercad.com/things/7IDkNnKeJFA
Specific supplies list:
NeoPixel Mini Button PCB https://www.adafruit.com/product/1612
To do list:
1. Wire the ten LEDs in series, and stick them to the finger cover at a certain angle.
2.Glue acrylic nails to the finger cots.
3.Refine the Arduino code, try to make more effects.
4. Test on the LED lights.