The ROTJ glove color is white and light grey. They are basically the same gloves used in ESB, but time and weather lighten them up really good. Here's a pic in preparation of filming a segment in the dessert from ROTJ
If you plan to buy S1's gloves, the recipe he has is to damp them but just the grey part with a cloth or sponge, and leave them outside in the sun for a whole day, and repeat the process as necessary.
I'm not sure if lycra will get dye and stick to them. But if so, make sure to do that BEFORE you sew in the white details to the fingers and forehand. They are white, and not the same color as the whole glove.