It's amazing what firing tachyon particles through a positron beam utilizinf the trans-perambulation of pseudo-cosmic anti-matter can achieve!
Now, say you're sucked into a parallel universe in your smartest of smart outfits. You arrive on a beach, and after farting about in the sea & sand in said outfit (for you don't want to go a-skinny dipping in forn parts where your parts may cause interdimentional outrage), you then trudge through muddy fields and jungle until you find A Place Of Residence, where you can get clothing to fit in with the general populace.
Now, what happens when you get sucked back into your originating universe? Do you stand waiting for the tube in all your other wordly attire? Do you buggery sod as like!
In order to prevent you from sticking out, them Illluminati that monitor the points of dimensional intersection thoughtfully nip back to where you entered, retrieve your original clothing, give it a good old laundering and redress you! Not only that, they also ensure that you're free from grime and sweat!
In other words, as you exit, they freeze you in time, strip you naked, give your nudie body a good old soaping, redress you and plonk you back in the real world!
Well, I for one ain't going near any tachyon laden sections of the multi-universe! I'm not saving the galaxy and batttling beasties and evil tyrants just so some transdimensional trollop can whip me kit off and start giving me a full all over bed bath and soaping down me nether regions...
...hmmmm. Maybe I should reconsider, and go off a-searching for anomalies, with biological experts running about in naught but their briefest of scanties in extremely hot flats...
Now, how do you find G'Kar's auditory device...