You can use to a T or to a tee to mean perfectly or exactly right. For example, if something suits you to a T, it suits you perfectly. If you have an activity or skill down to a T, you have succeeded in doing it exactly right.
双语例句
例： Everything had to be rehearsed down to a T.
排练时，一切都得达到完美的程度。
例： The description fits us to a tee.
这个描述恰好符合我们的情况。