I know several guys that use one leafy outer layer and then layer underneath it. It works pretty well. Personally, I don't like the sound of synthetic leafy suits. Then again, I'm pretty anal about noise when bulls are in close. I've been elk hunting for a couple of decades now in Sept and the following are the clothing items I pack year in year out.
1)Silk base layer tops and bottoms: 1 set for ultra light, 3-4 if weight is no issue(buy it cheap from Sierra Trading post) I avoid poly because it stinks so bad you have to throw it away after one hunt. (or maybe I'm just a stinky goat)
2)Merino Wool underwear. 1 set(Sierra trading post again, doesn't matter the make or maker.. you can spend nothing or a Ufronte fortune) You can wear it by itself but I mostly wear it with silk underneath for less than 50 degree highs. I don't care what they say it feels a little itchy after a day or so of not bathing. Silk is soooo comfortable next the skin.
3)Synthetic pants and button up shirt (You can go high end or very cheap. (Cabelas microtex is a great, quiet, cheap fabric) I like synthetic pants for 60 or above mid day highs.
4)Wool Pants (Sleeping Indian high end... Army surplus olive on the low end. Also Columbia makes a mid range that isn't too bad) If its wet or colder I wear wool lowers. We hunt with wood stoves so if it gets wet we dry in with a hummer of a fire in the evening. Its a funny sight to see two guys next to a rocking wood stove steaming their wool.
5)Fleece long sleeve coat. ( Again you have endless options) I always pack this with to handle mid day squalls or cold temps. Even on warm days, I nap in the shade snuggled up in my fleece jacket. I like fleece because its light weight in my pack and doesn't absorb moisture.
6)Good gaitors and good boots!!!!! Can't stress this enough. Hell wear carharts.. but buy good gaitors and the best boots you can afford.
7)Rain Jacket (packable camo quiet fabrics if possible) Mine packs down to about six inches square and about a pound or more. I again always have this in my pack. Its a safety item.
8) Ball cap with a stocking cap that I wear over the cap to cover my ears. I have a wool overhat that I bought last year from GWW that is awesome! (but not essential)
This system will take care of you from 25 degree snow days to 80 degree afternoons.
Most Days I wear silk with synthetic, gators and take the fleece jacket and rain gear with me in my pack. I make the morning hike with only my silk shirt on. You should start out freezing. Don't worry you'll be sweating 5 minutes into the morning climb.
When weather rolls in, I just layer as needed.
The second day of the season last year (sept 5th I think) I had every layer on(silk,merino,synthetic shirt,fleece uppers and silk,merino, and wool lowers with rain jacket as a wind blocker) and bucked a blizzard in comfort. The next day it was 70 again mid day. As many have said before me...Its better to take many light layers rather than one or two heavy layers. Hope that helps.
Jeff