HI! you can probably retop the pants and body at the same time, but the shirt should be its own. you should work o your lower leg anatomy, this guy has no gastrocnemius muscles (google it) and no real backhead. other then that its looking pretty good!
The folds on the pants don't make any sense and are too blobby. To avoid that, look at several photo references while sculpting the folds and don't jump too quickly to a high level of subdivisions, that's why it looks so blobby. You might as well rework on the anatomy of the arms, but it's quite hard to be more precise as…