Tailored clothes look good on everyone. Being skinny is a plus not a negative.
Just dont were stuff that is too big and wide for you. Its shapeless and makes you looks messy, and immature.
Add color, and texture for dimension. Patterns but nothing too big.
Pinstripes lengthen, horizontal stripes widen.
Small details can mke you look bigger. Large details can make you look smaller.
Brighter colors draw attention, darker colors slim you out.
So find your best assets and draw attention to those.