I've noticed some fans balk at the mere idea of the Electric Mayhem finally updating their wardrobe...I say why? If everyone else can, why not them? If anyone, musicians should be updating their look; especially when they've been in the same garish 70's look for ages.
The Electric Mayhem
HAS changed it's regular wardrobe over the years, and with the exception of Janice all of them seem to have gone back to their original outfits at times during the past decade.
During the 1980s Dr. Teeth switched from a furry colorful vest to a black leather vest, switched from wearing blue pants and brown boots to black pants and red boots (see A Muppet Family Christmas, when the camera pans over characters in the carol sing, during the song.... Hmm, don't know the title, but it's what's sung before Floyd and Janice sing "The Holy and the Ivy"), and switched from red and purple stripes to black and red stripes. He seems to have gone back to his original outfit by the early 2000s (I know he's present in the big crowd in Muppets From Space when the alien ships land, but I'm not quite sure what he wore there).
In the last season of The Muppet Show, I think starting with the Shirley Bassey episode, Floyd switched from his Sgt. Pepper outfit to a red jacket. The shirt he wears with it seemed to have been inconsistient, sometimes beign black, sometimes being white. I noticed that in the Paul Simon episode he wore a big purple tie with it. Floyd also wore a checkered shirt/jacket in a handful of 1980s productions (Rocky Mountain Holiday, A Muppet Family Christmas). Since the 1990s he has occasionally been spotted in a blue jean jacket and brown hat (in a Muppetism, the Studio DC specials, and elsewhere). He did wear his original outfit at Muppetfest back in 2001 (ironically, considering this was the first time he wore it in a long time, Gonzo asked Floyd why he always wears the same outfit... And Floyd claimed it was a new suit).
Also in the last season of The Muppet Show, Zoot switched from his original clothing to a zoot suit, which didn't last too long. In The Muppets Take Manhattan and A Muppet Family Christmas he wears a plain blue shirt (I'm not too sure if those are the same or not). In his few appearances on Muppets Tonight he wore a dress shirt similar to his original, but also wore a tie. I'm pretty sure I've seen him in his original since, but not too sure where.
Janice switched from wearing her pink tanktop to wearing a sweater during the last season, though she still wore her original outfit for most of the season. She wore her new sweater in the episodes with Melissa Manchester and Hal Lindon. In The Muppets Take Manhattan she wears her sweater at the beginning but eventually switches to a more '80s style, in addition to wearing that pony tale she's had since then. Since around It's a Very Merry Muppet Christmas Movie she's been regularly seen in a short-sleeved white shirt. Unlike the other members she's the only one who hasn't gone back to her original outfit (ironic as that was the least dated of the original EM clothing; I feel like Zoot's original attire isn't time speciffic either), but she did wear her 1980s sweater in Letters to Santa.
Animal pretty much kept his original clothing for the longest time. What he regularly wore on The Muppet Show stayed the same throughout the series. Animal started wearing different outfits in the 1980s, most of which were one-production-only outfits. On Muppets Tonight he often wore his original outfit again. Then in Muppets From Space he switched to his white t-shirt with orange sleeves, and hasn't been in his original outfit since. I think he's worn a long-sleeved shirt (similar to what he wore in The Muppets Take Manhattan, the one that wasn't a "I (insert heart here) NY" shirt) since Studio DC.
Lips never really got a regular wardrobe change (though with the limited amount of appearances it seems he was seen wearing other outfits more often than his regularl clothing). But he, like most of the other members, did wear a purple tuxedo on The Muppet Show (he probably wore that more often than his regular clothing, and considering his solos in the opening and closing, fans who remember him may remember him better in that outfit). He also wore a snazzy outfit in the Shirley Bassey and James Coburn outfits (it seems like most of the band was dressed the same in "Barnyard Boogie" and "The Roarin' Twenties" sketches... And then Floyd and Zoot kept their new outfits from those scenes). Even then it seems he hasn't been seen in his original clothes since The Muppets Take Manhattan (he wore a very siilar but different colored outfit in A Muppet Family Christmas), though I can't remember if he wore his original clothes when he appeared at the Christmas in Rockefellat pre-show.
Interestingly, while all of the (original) EM members have changed what they have regularly worn many times, they are rarely depicted in illustrations or merchandise in those newer outfits. Pretty much every time the band is in illustrated form they are seen in their original outfits. I wonder why that is (of course since 1990 they haven't had as much exposure and The Jim Henson Company probably never thought to include images of them in their updated wardrobe in style guides).
Miss Piggy, Gonzo, and Pepe also get frequent wardrobe changes. Gonzo gets a new regular outfit every few years, Pepe seems to have done so as well, and Miss Piggy hasn't really had a rgular outfit since season three of The Muppet Show.