I try to be very visible to motor vehicle drivers when I ride my bicycle at night.
I attached high-reflectivity vinyl strips to a pair of work gloves.
The reflector strips extend all the way around the cuffs, so it's visible front & back when I hold up my arm as a turn signal.
And the vinyl reflective material stays very visible in the rain.
Commercial alternatives: I didn't find any I liked which were reasonably priced. Reflective piping is not sufficient; you can't see it very far. Cloth reflective materials lose reflectivity when wet; they are less visible in the rain when you need them the most. These gloves are close: They have good vinyl reflectors on the backs, but not the front, and are pricey: http://goo.gl/eKCJBL
So I made my own...
Step 1: Parts and Supplies
Get some sew-on vinyl reflective tape. Get the widest that will fit your gloves. I got tape that was 1"/25mm wide. Either buy it new from a business like Identi-Tape, Inc (http://www.identi-tape.com/sew-on-vinyl.html) or cut it off an old mesh safety vest like I did from Harbor Freight (http://www.harborfreight.com/reflective-mesh-vest-3604.html)
Get a pair of work gloves with wide cuffs from your favorite store. I like any of these: http://www.harborfreight.com/catalogsearch/result?q=red+work+gloves
An office stapler
Step 2: Assembly
Cut the vinyl strips to length to fit around your glove cuffs.
Staple the vinyl strips all the way around the cuffs of each glove, front and back.
For best results, I recommend you staple from the inside-out, so the pointed ends of the staples are outside.
The first time I made these, I stapled from the outside-in. Unfortunately, the points often scratched my wrists or caught my shirts. Not fun.
Step 3: Done
Test them. Get in your car at night, shine the headlamps, and have a friend bike past wearing the gloves. You'll like what you see.
Step 4: Re-do
Then, when your gloves get holes and the lining shreds, remove the staples and transfer the vinyl strips to a new pair of gloves. That's actually what I did while creating this instructable.
The gloves typically last me 9 months to a year.
Future enhancement: Even wider reflectors. When these vinyl strips wear out, I am going to replace them with 2" / 50mm wide tape.