Wrap-around skirts (such as the Ie Faitaga of Samoa) are traditional masculine formal wear in the Pacific Island cultures Sulani is based on.
The random generated outfits are easy to go in and change with hardly any effort. For random npcs, I just use the styled looks then tweek a little bit. Personally, I go in CAS though manage world once every sim week to fix random outfits. I put only sims I see frequently in the "my households" screen. It doesn't take much effort and I only change looks for households in the "my households" screen since those are people my sims interact with daily. The male frame has a few full-body suits so they are not lacking for choices too.
for me - i do big clubs to play with kids and their friends, and all of them are in skirts :) we all play the game differently, I spend a looooot of time in cas redoing sims that are in the world. So for me it's really a big issue to redress 10-15 kids every time when someone grows up.
Using the styled looks for npcs that you don't play, but are in the friend group background, doesn't take much effort. Oh, and if you are on PC, there is styled looks CC to help give more variety of looks. The outfit randomizer favors trying to use from every category, especially accessories. It has been that way since the beginning. The randomizer also favors certain dlc packs. That skirt rarely is randomized on my own male sims. My own game usually favors Snowy Escape content for formal. I think there is a program (Sims 4 studio) or mods that can disable items for random, if you are on PC and want to fix it for your game.
