Hats: a tricorn or some variation of a tricorn, would be the most appropriate hat for an English settler. A workman’s hat of linen or other appropriate material would also be useful.
Shirt: linen, any period correct style and color shirt with a short collar will do.
Neck stock and/or scarf: A neck stock is a piece of cloth that has ties or buckles on the back and is secured in that fashion. A neck scarf is a 36"x36" piece of silk or linen that is rolled up and worn around the neck.
Work Shirts: Long, loose linen or canvas work shirts are nice to wear around camp, or even in the field when hot (although you must have some sort of coat or jacket as well). These are made with heavy linen or canvas and are made exactly like a shirt. DO NOT wear heavily fringed shirts with capes that are open in the front. They are Rev War period. Massachusetts Provincials during the 1750's had linen or canvas work shirts, not fringed hunting shirts.
Waistcoat: Mid-eighteenth century waistcoats were long (thigh length) and usually made of wool or linen. If no coat is being worn over it, the waistcoat is usually sleeved.
Breeches: Depending on your impression you can wear any number of different styles. If you are a farmer you would wear breeches, either "French Fly" (preferred) or narrow fall. Wool or linen would be used, quality depending upon your impression. The provincial Soldiers were issued wool,
Socks: Knee length Linen or wool, or wool/cotton blend. You are going to find wool easier to find than linen. Sock of almost any color will do.
Gaiters: military style gaiters may be worn if you are wearing britches. These button up the side, reach mid thigh and are most commonly made of brown dyed canvas.
Garters: Cloth ties, or leather buckle garters should be used to keep socks in place.
Shoes: low cut buckle shoes, low cut tie shoes, or moccasins.
Glasses: If you wear glasses, you should have authentic style frames.