Yellow left handed glove left over from the "Honor Guard" service works for me - so far.
Signalling a right turn it helps if one holds the hand/arm outstretched to the left and palm back, then raises the arm vertical and points right with the index finger.
But that is all "gestures" attempting to convey more information simply in an I-Phone screen age.
Ever watch a good intersection cop direct traffic?
https://www.youtube.com/watch?v=BVJ8xR3F7uU
Joe K