Flats under an overcast sky
No need to wait for a clear sky: you can shoot tee shirt flats on an overcast day, too, as long as you're pointed at a uniform area of sky. And you can shoot any time of day. At dusk just before beginning an imaging run is a great opportunity to shoot flats. But as mentioned before, make sure that sunlight isn't falling directly onto the shirt: use a card or something to shade it if necessary.
If shooting with a DSLR, just use the camera's aperture-priority exposure setting.
As a rule of thumb I usually shoot 20 flats.
-Joe
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