Rachel (4th of 5)
When Rachel was mortally injured, the Phoenix Force took her body into space, wearing the green Phoenix costume (of Phoenix II) again. Once Rachel’s health was restored, she decided that this costume didn’t feel right, so she changed it to the color scheme used by Dark Phoenix. [Excalibur #64]
And...
At one point Rachel entered the timestream and wound up 2000 years in the future. There she grew old and founded the Askani Sisterhood under the name Mother Askani. Rachel was again wearing her Hound costume, but on top of it a purple robe.
With the Askani timeline erased from existence, Rachel again found herself in the timestream, wearing the Dark Phoenix costume once more.
Iceman (1st of 11)
Upon joining the X-Men, Bobby was given a training uniform by Xavier. However, it wasn’t the standard version but a modified one, suiting his special abilities. By covering himself in snow, Iceman did not have to fear being recognized, so he had no need for a mask. Actually, his outfit was nothing more than yellow shorts and a pair of boots, though they sometimes, like the pants, were iced over too. [X-Men (1st series) #1, 5]
Soon, Bobby improved control over his abilities and his snow-like form hardened into an ice-like, almost transparent exterior [X-Men (1st series) #8]
(Iceman (2nd of 11)
After the team had proved themselves in battle time and again, Xavier rewarded them with the right for individual costumes. This set was designed by Jean, whom Xavier had secretly told of this plan before. There was even a new “costume“ for Bobby, as his shorts and boots were now colored blue. But, underneath his icy exterior, it didn’t really matter. [X-Men (1st series) #39]
Iceman (3rd of 11)
While with the Champions, Bobby came up with the first real costume, covering his entire body, after his romantic feelings were rejected by Darkstar. Determined to prove himself as a hero, he wanted to start by looking the part and came up with this light blue and white combination. [Champions #14]
Iceman (5th of 11)
Long months later, when the original five X-Men reunited, they came up with the idea of X-Factor. To the media, they acted as a mutant hunting group, while secretly they were trying to help mutants to handle their powers. Scott’s teammates wore similar dark shades so that he wouldn’t stick out. In situations that required the use of their powers, the team used the cover identities of the X-Terminators along with a new set of costumes. [X-Factor #1-2]
Iceman (7th of 11)
After Loki tampered with Iceman’s abilities, increasing them to a level that he could no longer properly control, he had to rely on an inhibitor belt to keep his powers in check. Ironically, the device had been built by a mutant-hating group, intending to negate his powers, but they had not known of Iceman’s power boost. [X-Factor #23]
Iceman (9th of 11)
Only a few weeks later, X-Factor rejoined the X-Men and, again, new costumes were in order. [Uncanny X-Men #284] This was possibly the costume that Iceman had been wearing for the longest time, though it is not that well known, as he is either seen in ice-form or in civilian clothes most of the times. The costume was originally dark blue and white, but later was presented in two different shades of blue most of the time.
When the High Evolutionary canceled all mutant powers on a global scale, Iceman temporarily returned to the X-Men to help them against the scientist. He was wearing some basic blue outfit with a yellow X across the chest area. [Uncanny X-Men #380]
Iceman (10th of 11)
By the time Iceman fully returned to active duty, the X-Men no longer wore bright costume, but were using some leather outfits that almost look like street clothes. The members had a vast supply of different shirts, coats and jackets from which to pick. Bobby mostly stuck to leather pants, Hawaiian shirts and a longer coat. [Uncanny X-Men #395] Around that time, Bobby also gained greater control over his ice-form, now being able to transform his hair and his clothing as well.