I would go large and loose with gloves because you may need to wear your fingerless cycling gloves underneath them for long rides. Also, loose fitting clothing is warmer in cold temperatures.
The liner may be form fitting. One of the best methods really is to have a pair of full finger bike specific cycling gloves. Non winter kind. Then layer an inexpensive polyester fleece glove over that and then a thin nylon shell for wind protection. This method is really warm and has flexibility as you can wear any combination you need depending on the temperature. Then you can pull them all apart for easy drying between riding. Because the fleece does not compress as much as batting type insulation it is warmer under your palm were you grip the bar.
Getting your gloves dryed out between rides is a big deal.
This approach will work well for all but the coldest conditions. After that you need to go to pogies and mittens.
Last edited by Hezz; 09-23-09 at 11:10 AM.