If you really want a baker for winter, you're better off with bedsheets or light canvas - then the fire isn't going to melt enormous big holes in it with sparks and embers, and you can have a decent fire near it.. To get the reflective effect then just hang a reflective space blanket inside the tent behind you to reflect onto your backside.

Cheap wal-mart high threat count bedsheets and canvas waterproofer man..