Been reading some of the posts here.

Validates the point to me that everyone is different.

I have, and likely will tomorrow through Tuesday, sit in low 20s-mid 30s degree from around 6:45 until 11:00 am. Id say the wind will be blowing 8-10 mph. I may stand up once an hour to give my back a rest. I'll be sitting on a cheap walmart cushion seat, on top of a rock in a place that the sun won't be hitting until 10:30 or so. I won't be warm, won't be too comfortable, but it will be totally bearable.

My clothes are fairly basic, with a few nice pieces thrown in, but it's works for me.
I'll be wearing:

Old Under Armor 2.0 base
LL Bean Midweight Merino Base Layers (they call it 250 weight)
Carhartt Midweight Hoody
Microtex pants
Kifaru LPP
HPG Mountain Serape
Darn Tough Socks (the heavy ones)
Cabelas/Meindl Denali
Blaze orange hat from Cabelas (cheapo)

Usually just wear a cheap pair of thin gloves and keep a handwarmer or two in the pocket on the LPP or my Hoody.

Been doing basically the same for a few years and it's been working for me. Replaced Berber Fleece windstopper pullover last year with LPP and haven't regretted it. I don't carry my bibs anymore since I've got the Mountain Serape. I get cold sometimes, but I honestly think you will no matter what you bring if you're not moving at all.