In Amsterdam, there is no dress code, and you can wear whatever pleases you. It is fine to wear shorts and short skirts. You can take a Winter coat, scarf, gloves, jeans/warm trousers, tops, a full-sleeve shirt, a t-shirt, pants, a scarf if you are visiting Amsterdam in winter. The perfect outfits for summer would be a light cardigan, more heated jacket, sandals, sun cream, sunglasses, sunhat, shirt, pants