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As I understood from your post, your project is in the realm of "wearable" tech. The RPi to be used must be small enough to be able to be "sewn" to the prop, for this the likely candidate will be a Raspberry Pi Zero, driving a LED strip based on 3528 SMD RGB LEDs.
If the prop do require that the lighting/color pattern changes via remote control (via WiFi) then a Raspberry Pi Zero W would be the better candidate.
The LED strip color/brightness pattern(s) may be programmed using either C++ or python scripts.
For just pre-programmed lighting/color patterns (not requiring remote intervention), an arduino nano (or micro) may be able to do the same job as well.
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