Do a google search for unisex childrens clothing. There's quite a lot about online.
Personally I cannot bear bows, ruffles, frills, tassles, lace trim, puffy sleeves, cap sleeves, peplum frills, gathering, tucks, glitter, diamantes, sequins, sparkle, shiny stuff, diamantes, animal print, halter necks, boob tubes, spaghetti straps, crop tops, short shorts, mini skirts, beading, silver embroidery, butterflies, flowers, fairies and princesses, hearts, stars and try to avoid that but on the high street it's pretty much impossible.