Winter Fashion Trends For Girls. Slim black trousers, black and white windowpane sweater. Oversized black tote and sunnies. If you prefer to acquire more from a trend, then elect for pieces that may be layered with differentclothes. As stated before, one has to be careful of trends. A guide to the fashion trends for girls hitting baby and children’s wear this Autumn and Winter. Plus, cute outfit ideas and key pieces to buy.From vinyl trench coats to hot pink statement pieces and PVC everything, these are the 20 winter trends you should be investing in for 2018.