I have a uniform at work so no worries there.
I am petite to answer the other question. I have just been told on another forum that-
Cute tops (Say, one with a cat face on it)
Shorts worn with tights underneath
Converse trainers
Cropped jumpers with denim shorts
are mutton dressed as lamb for 29 year olds I wear a lot of that sort of clothing so am worried now.