Game:
PSO2:New Genesis

Feature:
Body paint, Hairstyles tied to glamour plate

What I like about it:

Body paint works as a layer under the clothes, and usually things like socks, tattoos, stockings, gloves and such fall under this layer. What this allows is for more complex styles, and more seamless transitions between leg-shoe pieces for socks and such

Hairstyles beign tied to Plates is self explanatory, you sometimes want a more agressive look for a style, tied hair for a jacket, or long flowy hair for a dress, so it allows me to pick how my character does their hair based on look without summoning the aesthetician

How it differs to me from FF:

Body paint is non existent in 14, and if you try for example, 2B bottoms with Frontier shoes, you will notice how the stocking CUTS right at the end of the leg, leaving the bare foot exposed in the shoe. It looks terrible, so a body paint layer would help to make it more seamless. They could even implement it how other games do, PSO2 has 2 slots for body paint, BDO has tattoo customization and underwear slot, and so on

On the topic of hairstyles, it always its a hassle to change your hair for a different one. You have to even cancel queue if you are waiting for a duty in order to do it. So having a "Hair" slot on plates that you can freely set would go a long way into improving looks. PLUS now that there is hairs on the mogstation the feature would possibly boost sales

Bottom note is, more character customization is good, but it needs systems to support it in order to give it more shelf life