I'm sure the percentages are equal but it sure feels like they aren't. Just anecdotally it seems the pants and gloves have the worst drop rate (and yet are the two required to help make up the lost accuracy on the weapon), and everything else Dragoon specific drops like gangbusters, and yet are generally the most useless/interchangeable pieces.

I've been doing Coil since about the second week of the game and I only got my pants a week ago and have yet to see the gloves.