Word of the Day: "Unbifurcated"
Bifurcation is a fancy word that means splits (forks) into two (bi) parts. A road can bifurcate. Pants are an example of bifurcated clothes. You could call all clothes that are not pants unbifurcated clothes.
I've first read the term MUG (male unbifurcated gear, or men's unbifurcated garnment) on the website of Macabi, but it is being used on other websites as well.
Dresses, skirts, gowns, kilts, sarongs, thawbs, cassock, izaar ... are all unbifuracted clothes.
So get your MUG and join the unbifurcated lifestyle!