How visible will the bright yellows/greens be if I'm riding east into the rising sun?

I talked with my colleague some more today and she said the thing she noticed the most was that she could not see me sign my intent to take the lane. Do you think reflective gloves of some sort would help?

Mr.SR500 - I've now logged 20 centuries for season (March to present). The club puts one on almost every weekend. The one this weekend is suppose to be very hilly/tough.