fit 指大小、形状的合适,引申为吻合、协调.suit 指合乎需要、口味、条件、地位,以及花色、款式等与某人的皮肤、气质、身材或身份相称.
如：
This new jacket fits her well . 这件夹克很合她的身.
对比：
This new jacket suits her beautifully . 这件夹她穿着真漂亮.
That colour suits you best .
Try the new key and see if it fits the keyhole .
Does this time suit you ?
No dish suits all tastes .