IME, yes. One set of base merino will do for a week-long trip.
I also agree with Kevin on the backup sleeping closed-cell pad (doubled up it gives extra padding and protection for your Neoair, in which case you could leave the Tyvek sheet at home).
I use a MH Plasmic rain shell, which works well enough. It would be a good idea to run your list by your outfitter. The location and circumstance you'll be hunting under may require specific items.
