Well I run cold and not very familiar with firstlite but have hunted that season often.
Where is a big factor. For example mid elevation sage county or up high thick timber. Either one can be cold and wind will cut through you.
So having insulation top and bottom. The bottoms could be a woobie type blanket, puffy pants or ski pants from target.
Spare socks and switch them at lunch. Gloves. An insulated mitten and a traditional snow glove for when you need some dexterity.
Some kind of shelter. A $10 poncho, $400 cubes fiber tarp or something in between for a wind break.
Something to cover your face.
Good gaiters, at least in the truck for a game time decision.
Ice cleats, ya new to me. Bought a $20 set for ice fishing and they are awesome when walking over snow crusted rocks.