How are those T-Tops going? What yarn are you using? Spill!
I have about six inches knitted and the next thing I need to do is decide how long I want my top - Never, Never just knit it the length specified in the pattern!
Pull something out of your closet that is the length you would like your T-Top to be. Measure from the bottom of the armhole to the hem - this is the length you will knit NOT the length specified in the pattern. Note - this may cause you to use MORE or LESS yarn depending on how your sweater is going to differ from the pattern.
If I were to knit the length given for my size, the bottom will be about four inches below my waist because I am very short waisted - there is no right or wrong length - it is just a good time to THINK about what length you want :-)