Merlin sleep suit.... pros and cons

my DH suggested buying a Merlin sleep suit for DS who is 4 months old and has stopped sleeping long stretches at night and constantly wakes himself up.

here are a few things to consider: our house is naturally on the warm side, when it's 40 outside it stays around 73, inside which in my opinion is warm, when the heat is set to 68-70 during the day. Sleeping in cotton footed jammies, i find DS a little sweaty on his back at night when it's above 71°. he also has some skins issues similar to excema and some spots that flair up with heat and close contact, almost like a heat rash.

now that it's winter in Indiana, our house is round 69 at night and I have a fan running in the nursery. DS'S hands and

feet are usually cold.

I'm not feeling too comfortable with this thick sleep suit. advice please?