On a budget, try WalMart Rocky Heavy Thermal Fleece top and bottoms for about $30 total
hunting Missouri, I layer cheap WalMart thermals. I find Rocky brand Fleece Thermals more than adequate.
About $18(Rocky cotton) and $25(Rocky fleece) are my total thermals investment in the last 15 years. In MO, it is rarely below 25 F before November gun season. If I hunted colder climates like Minn, Wisconsin, Mich, Canada or New York then I would consider investing in First Light Marino Wool.
60 to 45 degrees F, I wear my lightweight cotton Rocky WalMart thermals.
45 to 40, I wear my medium weight WalMart Rocky Polar Fleece thermals.
40 to 30 I wear the Rocky lightweight and the Rocky fleece.
Below 30 I again wear both base layers but switch from a bdu cotton pant to a heavy insulated bib overall.
Below 20 I don't go.
Marino wool just way too expensive for me. Heck the Heavy Polar Fleece thermals at BassPro and Cabelas are too expensive.