This question (the original thread topic) is one I've been asking myself lately.
I have a stealth jacket (which I love) and have been debating whether to spring for the bottoms or wait out for the issued rain gear. i have had the oppurtunity to borrow some of the new rain gear and for me, it would be for strictly cooler weather only. I'm a definite winter person who sweats easy and not being able to remove the liner of the rain gear relegates it to pratically winter only. I can usually get through a moderately cold day spent mostly outside with just polypro, stealth suit and combat shirt. I put my combat coat on maybe half a dozen times this winter in Pet, granted i wasn't on exercise or anything. Just a few cold days at the range, taskings, etc. Usually if I think I might be cold, fleece is enough. I hate bulking up on clothing unless absolutely neccesary.
That being said, I will probably be buying stealth pants which kind of dissapoints me as that will just mean more kit options/complications when i get the rain gear. I was hoping to simplify things and be a little less out of pocket. If only the liners were removable (although the ideas here are interesting).
There's a stealth suit in the 1 RCR kit shop, which appears to be MARPAT and has a removeable fleece liner plus nicities like pockets. It would be ideal for me outside the fact I couldn't wear it on the outside ala rain gear without fear of jacking. At $175 for each piece, it isn't cheap, but not a whole lot more then a regular stealth suit.