How to change simple clothes into wearable fashionable clothing?

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My parents never take me shopping and I always get hand-me-downs and I’m almost 17 so I want to wear things fashionable so all I have is like 1 cardigan, mostly plain T-shirts and jeans, someone gave me some nice Anne Klein clothes but I can’t wear them because they’re too old and business-like for me (I can wear the dress pants, they’re okay). How can I change some of my clothing into nice Spring clothing?

Answers and Views:

Answer by AKAFashionInterior
accessorize, wear a belt or a hat or you can get some things to gem your clothes and add extras to them

Answer by Ashly
Accessories!

Go for cute and colorful SCARVES to add flavor to a solid T.

Find nice, flashy BELTS that draw attention to the outfit.

Get shiny, dangling EARRINGS that match your shirt or shoes.

HANDBAGS can make the outfit seem more mature and put together.

Those simple things can make outfit pop whether you’re wearing simple jeans, a T, and sandals or not.

Answer by Ji
You may read some books or magazines on clothes and see how clothes can pair up.