The white circles on the chest, prevalent in his original costume, became less a fixture of his costume over time.
Then there was a godawful later on X-Factor suit with a bunch of weird tech looking stuff, his Mutant X outfit which was a stylized version of the black suit with yellow bracers/belt, and his current outfit which has lines that glow based on how much energy he emits.
IIRC, his uniforms function as gauges for how much energy he has stored up, since too much will cause him to go haywire.