what about Havok...
Havok was given his first costume by Larry Trask after his Sentinels captured him. The strange headgear with a special gemstone in its center and special circuits in the costume limited his energy powers to a controllable degree. The pulsating circles on the chest indicate the amount of cosmic energies Havok has stored. Although Alex later learned to control his plasma blasts, he continued to wear this outfit for a very long time. [Uncanny X-Men #58]
When Havok accepted to lead the new governmentally sanctioned X-Factor, he was given a new uniform that went along with a blue and yellow team look. Havok’s outfit consisted of blue baggy pants, a blue shirt with a huge, yellow X on the chest, a dark leather jacket with an X-symbol over it and gloves. [X-Factor #71] While Polaris eventually changed her outfit, the other members of this group left one by one, leaving Havok the last one still wearing this team look.
Havok was eventually kidnapped by the Brotherhood and experimented on. When he next showed up, apparently brainwashed by the Dark Beast, he was wearing a modified version of his containment suit, with bulky red gloves and red shoulder straps, possibly containing some technological equipment to measure his energy output. [X-Factor #125]
Or shall we try Remy...
When Gambit first met Storm, he wore a rather unique form-fitting costume, with the pants and sleeves colored black with stripes of magenta and the torso entirely magenta. He also wore knee-high metallic boots, fingerless gloves and a headdress and was rarely seen without a long brown trenchcoat. This outfit is most closely associated with Gambit and he has worn it for the longest time. [Uncanny X-Men #266]
For a short time, all X-Men, including Gambit, wore Dr. MacTaggert’s new design of the classic blue and gold X-Men uniforms. Gambit once more combined it with a headdress and his coat. [Uncanny X-Men #273]
With the original five X-Men rejoining and the X-Men dividing into two strikeforces, the group returned to wearing individual uniforms. Many of them, including Gambit, donned the same outfits as before. [X-Men (2nd series) #1]
) For a time, the X-Men were abducted to space to help battle an alien invasion. They had nothing to wear but some Shi’Ar mining suits and other uniforms. Remy chose a dark blue suit with some metallic bodyarmor elements, though not too much to hinder his movements. The meaning of the Shi’ar symbol on the chest is unknown. It was in this costume that he was abandoned in Antarctic by his fellow X-Men. [Uncanny X-Men #342]
Back to civilization, Remy returned to his default uniform.
Only when, many months later, all X-Men re-designed their costumes, Gambit too changed his costume. While most of the team chose to go with a team look, displaying a prominent X-symbol, Gambit wore only a blue-black bodysuit with some red accessories (scarf, belt with a tiny x-buckle), large metallic boots with red knee-caps and, of course, his trenchcoat and headdress. [Uncanny X-Men #381]
And...
When Gambit left Xavier’s School and started hanging around the fringes of the X-Treme X-Men, he adopted, whether intentional or not, a look more consistent with theirs: an entirely black bodysuit with a belt, combat boots, kneepads and other accessories all in the same color. This was, of course, off-set by his ubiquitous trenchcoat. [X-Treme X-Men #4]