Waistcoats - 1740s-1750s

On a waistcoat, whether lined or not is entirely up to you, as it was back in the period.  If you plan on wearing it a lot during the heat of the day over a shirt, it was HCPC for it to be unlined in hotter and or more humid areas.  For Fall and Winter, lined would probably be more correct.  

If you are going out in the cold, then WOOL stockings and WOOL breeches will make all the difference in the world.  Heavy Linen leggins over them would "cut the wind" and keep you warmer, though wool leggins would be better.  I know some parts of PA can get bitterly cold and if that happens, then you could add period underwear like the below, or just do like most folks I know and wear modern "half pants" under your breeches, whether cut off thermals or not.  
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In the early 2000's as a Private Soldier in the Major's Coy, 42nd Royal Highland Regiment, we did an event at Fort Ward in Alexandria, VA during February in honor of Presidents' Day.  We called it "The Reenactment of the Battle that never happened."  Anyway, this was the ONLY event we were allowed to wear military overalls, because it usually got pretty cold.  Well, my period military overalls from the late 1970's no longer quite fit my early 2000's body, for some strange reason and I didn't want to purchase a new pair for this one event.  I figured the super thick wool we used for our hose (military stockings) and medium weight wool Philabeg (Short Kilt) would cover most of my exposed skin, but for this one event, I wore polypropylene briefs.  However, once I buckled on my cartouche box, my Philabeg kept sliding down on me.  It began snowing and got down to 31 degrees F, which is not real cold, so I finally jumped into a porta potty and removed the briefs.  That solved the problem of the slipping Philabeg and I decided I would just tough it out going "regimental" or authentic under the Philabeg, as I otherwise always did.  (BTW, I had lost most my resistance to cold after our little trip to Somalia on active duty in the early 1990's.)  

I was VERY surprised and pleased I was not cold down there at all, either standing still or moving, UNTIL I took a hit and lay on the ground.  As it happened, I deliberately had my legs pointing away from the crowd and back down the shallow ravine we came up through for the battle.  All of a sudden what felt like an Arctic Gale came blowing up the ravine and right up between our legs on the ground.  Many folks in the crowd mentioned "the screams of agony" of the wounded and dieing were all of a sudden "quite authentic."  We had to move our legs away from the wind and after that, it was tolerable.


Gus

While I have no documentation for support (in our period of interest), I use these bone pins on blanketing. Made from deer lower leg bone, scraped and sanded smooth with a slightly blunt tip. Slips between the weave with no damage.

Well those are darn neat! Coincidentally, I have a large brass pin with an eye and piece of marline attached for doing the same with a blanket. I think a lot of the ‘blanket pins’ available are of a Scots-Irish or Norse pattern. 

Mark Baker mentions carving a "pin" for his blanket. A bone pin isn't entirely out of the question...