There are many option if we talk about fashion for kids. If you want to buy clothing for kids dont forget to pay attention to your kid’s age and body size. Also the purpose of use, for daily activities of for special purpose like go to kids party, school, holiday, etc.. Perfect clothing will make your kids perfect!
For your boy you can buy casual clothing for boys to wear in playing time. Choose clothing that can make your boy easy to move, run, walk, jump and other activities usually boys do. Dont forger that a kid, boy or girl, usually like to wear clothing with picture of superheroes or cartoon. So do for your girl, give her special clothing for girl that fit to her body and style.
For girl who like casual style you can buy casual clothing for girl. She can wear it at privat school or holidays. Buy for her jeans, fun top, sneaker, etc. Dont forget, your kids are your assets! 
Informative post.