I think Sickleyield's Dress Shirt for M4 and H4 will work.

It's not dynamic, but it looks pretty good. Really interesting design. There two separate conforming collars. One the normal notched collar, one a mandarin collar, to be used with the same shirt body. I guess you could also go with no collar at all.

You just have to remember to adjust both the shirt body and collar, if you're using fix morphs.