I'm a bit confused about when he actually changed his costume and why he changed it, any help would be great. Thank you.

he changed his costume in Thunderbolts #110...not sure why...bu tthat's when...maybe read it and find out? lol

I don't like the new one...

actually read Thunderbolts #112

Excerpt from the spoilers:

Radiative Man asks to speak with Norman. He feels uneased by the fact that guards do not need to escort him. He doesn't think it's a good idea that his teammates see that. Norman replies that the Chinese government doesn't want him to appear as a prisoner. He also states that he does not like his new costume. Norman gives him the reasons for it and tells him to just wait until they can get a focus group to agree on a change.

"I don't like the new one..."

What did Norman say?

"What did Norman say?"