thermal clothes

My aunt in the US is about to celebrate her birthday and I'm thinking of buying her something from her favorite online site. The only problem is what to give her, maybe a couple of this thermal underwear for women or scarf perhaps since the weather in her area is still cold and sometimes it takes her so much effort to dress up in order to cope up with the weather. I hope there are sales and promos online for me to save and get some more stuff for her