How to remove dried latex paint out of painter whites
Lucky you. I've had to try to clean spots out with $80/gal reducer.   

When I work in such a readily available and cheap solvent, I take the garment off immediately, get the whole garment soaking wet, work it in a sink if possible, and bag it.  Then wash it within 8 hours or so.  Should recover nicely.  

Letting it dry is the mistake. This wrecks the fibers. You'll never get dried paint of of the fibers.