F#ck the rules, do what makes you happy.
If we all lived like a 4 year old who doesn't care what anyone thinks, oh how happy we would all be! My daughter used to dress as a fairy with gumboots every single day for about 6 months & she was awesome! She even wore that outfit to my Grandmothers funeral. It made everyone smile. Every person who ever stopped & commented only said positive things. Like "She is rocking that fairy outfit" or "That kid has got style" or "I love that she doesn't care what anyone thinks". She was happy. I was happy that she was happy. Can't we all be just as happy & confidant as a 4 year old in a fairy outfit & tutu??
If you want to wear mixed prints, do it.
If you want to dye your hair blue, do it.