Quantity   Component name
1 × ESP8266 ESP-07 Awesome WiFi module of ubiquity
1 × WS2812 Black LED Strip, weather protected Two plus metres of strip off of a single 5M reel.
1 × 3D Printed curved mounting point Matched with the shape of the hat front for a nice curvature and maximum display angle. Only on front half of hat.
1 × El-Cheapo novelty gentlemans hat decorative black ribbon removed.
2 × LM2596S DC-DC Buck converter. Ebay special, Adjustable, 2Amp, max 3Amp.
1 × AMS1117 3.3V 800mA Voltage Regulator Step-Down Module Ebay special. 800mA assured to allow full power requirements of the ESP8266, which can be surprisingly high.
1 × Lots of Wires, thick & thin, plus lots of Solder Much of it recycled from old CAT5 cable.
1 × RC Connectors, etc XT-60 battery connector + various bullet connectors and 0.1" male + female.
1 × Glue, Duct Tape, double sided foam sticky
2 × M2 or M3 nut and bolt Glued to the inside mount point and poked thru some holes, then bolted up, all to hold the display to the hat.