M8 no doubt Youtube would have some tuts on painting clothing and such but as theres so many different types of clothing out there I'd doubt you'd find one generic tut that would suit all, but for me clothing is like any other reference, paint what you see..Start light and work your way into the darks, try to avoid hard edges with cloth like clothing (Especially the folds), if its leather or such hard edges would suit..I use stippling a lot when doing clothing as it helps add some soft texture.. I think the second video part of the color portrait I'm working on shows a basic t-shirt and jacket combo which may help but its all in time lapse, the slowed down version won't be done until the painting is, so not a tut as such..You can find it here in the video section..Alternatively suss out other portrait style tutorials as many may have such involved but off the top of my head I can't pin point specific tuts, others may be able to point ya in the right direction..GL