How men in Moscow state looks in the XV-XVII centuries?

You can read about Moscow state in Wikipedia, articles Grand Duchy of Moscow and the next one Tsardom of Russia.

Russian men of this period wore shirts and pants like in Kievan Rus. Over the shirt they wore a kind of clothes named zipun. You can see zipun on the left of the 1st image.
Kaftan had been worn over the zipun. You can see two models of kaftan in the image (in the center and on the right).

Russian men also often wore fur coats. In the north of Russia climate is cold, so all the men worn fur coats. But boyars and noblemen sometimes wore fur coats in the summer too.

Source of information: a Russian book "The history of a costume (suit)" of  N. Kaminskaya.