Let me give you some examples~
Selena Gomez (Wizards of Waverly Place)
Selena Gomez's outfits are so color coordinated. Especially in the 2nd outfit, her seperate pieces of clothing aren't too fancy, but she puts them together so well that the belt and scarf stand out without clashing too much.
PS Love the shoes~
Samantha Boscarino & Bridgit Mendler (Good Luck Charlie)
I love both outfits here. Samantha Boscarino chose a really nice shade of purple (Note: your chose of purple can change the whole outfit) and the belt ties it all together (no pun intended) without standing out too much. She has a more fun-loving kind of style. Bridgit Mendler has a different style. She makes sparkly or shiny shirts accent without being so crazy. The shirt pops because of her jean jacket and the bag, since it sits in the back and accompanies it. She really has balance in her outfit.
Laura Marano (Austin and Ally)
If you can't tell, Laura Marano's style is pretty feminine. She wears bright colours (most likely because the show takes place in Miami) but she has neutral colours to tone it down. She basically has a way of putting things together. That yellow and brown shouldn't work, but it does.
Debby Ryan (Jessie)
I like to think of Debby Ryan's style as "tough, but still a girl". She still loves skirts and wears very feminine colours, but unlike Laura Marano, her colours and tones give off a stronger message exam. the jean jacket in the 1st outfit.Also in the 2nd outfit, the jacket is a very strong shade of gray while the pink shimmers behind.