
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.

to suit
To be suitable, appropriate, or harmonious in a particular context. It can refer to appointments, people, colors, or situations.
Der vorgeschlagene Termin passt mir sehr gut.
The suggested appointment suits me very well.

to pass
In sports, especially ball games, to play the ball deliberately to a teammate.
Der Mittelfeldspieler passt den Ball genau in den Lauf des Stürmers.
The midfielder passes the ball perfectly into the striker's path.

to pass
In card or board games, to choose not to take an action when it is your turn, for example because you cannot bid or play a card.
Ich habe kein einziges Ass, also passe ich.
I don't have a single ace, so I pass.
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 go
Gehen generally says that an appointment is possible or acceptable. Passen emphasizes more strongly that the appointment fits in with your own plans and is therefore suitable. With appointments, both words are often possible, but passen highlights personal suitability.

Freitag um zehn passt gut zu meinem Zeitplan.
Friday at ten fits my schedule well.
Freitag um zehn geht für mich.
Friday at ten works for me.