passen
to fit
To have the right size, shape, or fit. Used mainly for clothing, shoes, or objects that are fitted into each other.
Diese Schuhe sind schön, aber sie passen mir leider nicht.
These shoes are nice, but unfortunately they don't fit me.

to fit / suit / pass
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to fit
To have the right size, shape, or fit. Used mainly for clothing, shoes, or objects that are fitted into each other.
Diese Schuhe sind schön, aber sie passen mir leider nicht.
These shoes are nice, but unfortunately they don't fit me.

When clothing or shoes fit someone, that person is always in the dative. The item of clothing is the subject of the sentence.
Die Jacke ist schön, aber sie passt mir nicht.
The jacket is nice, but it doesn't fit me.
To express that two things go well together, for example in terms of style, color, or character, German uses 'passen zu' (to go with/to suit) + dative.
Ich finde, deine neue Tasche passt perfekt zu deinen Schuhen.
I think your new bag goes perfectly with your shoes.
A very common use is asking about a suitable appointment time. The person being asked is in the dative.
Passt es Ihnen morgen um 15 Uhr für ein kurzes Gespräch?
Would tomorrow at 3 p.m. suit you for a short conversation?
The meaning of 'passen' depends heavily on the context. With clothing it is about size, with appointments about time, in sports about the ball, and in card games about skipping a turn.
Diese Hose passt nicht mehr.
These pants don't fit anymore.
to stand
'stehen' and 'passen' can both be used with clothing, colors, or appearance. 'jemandem stehen' means that something looks good on that person. 'passen' often means that the size or shape is right. It can also mean that something suits a situation, color, or person well. Learners confuse the words especially with clothing. A dress can 'passen' because it is the right size. It can 'jemandem stehen' because it looks good on someone.

Die Schuhe passen meinem Bruder nicht, weil sie zu klein sind.
The shoes don't fit my brother because they are too small.
Die blaue Jacke steht dir wirklich gut.
The blue jacket really suits you.