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It makes no sense for trainees to wear different uniforms. All Workers wear a Worker's jacket. Recruits are still workers, so they wear the jacket of workers. Same with Civil Protection recruits. RCT's don't wear different uniforms, afaik. There just really isn't any reason to do this.
Yeah, but you can tell the difference between a RCT and a CP cause you can see their tag, also they don't have different uniforms because of anonimity, CWU workers always have their face out and don't wear a mask, and you can't tell the difference between a worker and a trainee until you ask them, so to speed things up trainees should have their color change