It's not an uncommon situation to find characters wearing 3 or more disguises because of how the system was changed. I've personally had encounters with characters literally wearing every disguise item in the game, layered correctly, as well as instances of characters wearing 2-3 hoods and then a poncho.
Why it's a problem:
-It greatly devalues the skill of disguise, which, based on comments at the town hall, many others also seem to be in agreement is way too much profit for too little UE expenditure.
-It encourages players to solve problems with chyen instead of roleplaying and building their characters to reflect the need to remain hidden for various reasons. If you're not good at it, take the chyen from your layered disguises funds and hire someone who's a ghost. You've already made 5X more roleplaying for people and have introduced significantly more risk into the equation.
-With even a modest investment in the skill and stats for the skill, it's extremely easy to keep a disguise up in a large hectic battle with even 2 layers stacked.
-People wearing four layers of disguises just promotes necksnapping people when it's already become way, way easier to necksnap people when you're attempting to strip them than it is trying to knock them out 15 times. I don't see this as a good thing.
-You can't see someone's eye color or hair style under their mask, their helmet, their hood, and their poncho. Let the more 'corporate' disguises where you're disguised by changing your appearance, not hiding it, not stack with items that hide your appearance.
-Make it so that there's a hard cap on the *benefit* you can get out of disguise layering. I'd personally say that it should be capped at two items. A face covering such as a mask or helmet, and then a body cover, such as a hood, robe, poncho or shroud.