Yo, next time you decide to cut your almost-back-to-normal hair into a mohawk, maybe check to see if you have a department meeting the next day. There is no way to debut a new hairstyle at a department meeting without having to talk about it for ten minutes. Even if you've had that hairstyle more than once since you started this job two years ago.
Also, on the same topic, maybe plan ahead a little better so you have some clean clothes that aren't black. Your middle-aged-and-older coworkers might not literally jump out of the way when you say "good morning" next time.
All about blending in, right?