LED Turn Signal on the Vest >> Is it O.K.?

[BusyWeb]

Hi, there.
I wonder that wearing the vest on which some Big Blinking LED Turn Signal embed is o.k.?
As sunset comes earlier in the winter time, I have to ride more frequently under the dark.
And worried about the being visible status by other drivers on the road.
Tried Googling, and found some creative people made Bicycle Vest with LED Turn Signal.
I want to implement it for the Bike LED Vest with simple blinking Left/Right/Stop signs.
May be with or without using bike battery power??
Some RF module which will be on the glove or handle bar??
Scrolling TEXT or animated ICON???

Anyway, is it legal (or allowed) wearing Big Blinking LED Sign on the bikers vest?