Harlem Shirts are good, depends on what weight you get & how wide & long you need them, some are thinner than others, the consistency isn't always there on them but if you buy enough dozens you can meet your needs. Yo Daddy is legit, ask for Mash if you call & tell him Jamal from Dallas gave him the thumbs up.
(Hip-Hop is what I do, hahahaha, but like Rodney said any shirt will do even if its not labeled Hip-Hop but meets your needs). I'm currently getting some shirts made with my private label to my spec & I will be selling off the current shirts I have (sealed in the dozens unopened) unless I decide to re-label with my collar tags but I haven't found a seamstress to do it yet.
I Hope that helps.