My 2 chyen on this.
Yes, this has happened and will probably keep happening to some degree.
That being said, I think the changes to how disguise works+NPC with disguises+players learning to imitate NPC for camouflage has improved things quite a bit.
The gloves thing? Disregard it, or work around it if you really think its a factor. For example, an old character of mine didn't have hand @nakeds because their hands where either always covered or inside their pockets. However, being able to differentiate NPCs from PCs because of the gloves is meta.
If X person has been seen and made wearing disguise A (mustard poncho), it is viable that you would get jumpy if you saw someone in the street wearing disguise A, but that doesn't mean person X is actually under that. At the same time, you could use this to frame people, you wear disguise A and people might think you are person X.
There are various quality of disguises and degrees of skill, as of the current build if you are good enough getting made is rather tough.
On a related note, I am more annoyed at the ludicrous and immersion breaking IC term coined as 'alias hopping' which is a clear result of people smallworlding and being meta. Unless you are actually the tools for it, SIC should remain anonymous.