At my local drugstore today, they had one brand of latex gloves in "S", "M", and "L" sizes, 50 to a box. The box is clearly labelled to show that they also sell "XS" and "XL" sizes, but these weren't available there, so I bought the "L".
These will work for my wife, and will be fine for painting or related jobs around the house, but are too small for me personally to wear for any length of time --- too tight. The last thing I need is to restrict my circulation when I'm trying to keep my hands warm!
I reckon I'll find an online place to buy a box of size XL.