If somethingfitsyou orfitsinto a place, it is the right size or shape for you or for that place:
[trying on shoes in a shoe shop]
Thesefitperfectly. And I like the colour. I think I’ll buy them.
I’ve put on weight and my trousers don’tfitme anymore!
Will this tablefitinto the space between the bookshelf and the wall?
If somethingsuitssomeone or something, it is right for that person or thing or situation, or it makes that person or thing look more attractive.
Wednesday at ten o’clock for the meetingsuitsme perfectly.
That sofasuitsthe room really well – the colours match the walls.
Black doesn’tsuitme; I look better in lighter colours.
We don’t usefitwhen we mean that something is right for a person or thing or situation:
This restaurantsuitspeople who like simple food.
Not:This restaurant fits people…