Cotton or Fleece Swaddleme's? (RP from Jan 2012 board)

bleu928

My littlest swaddlemes are cotton because DS#1 was born in the summer.  I'm wondering if they will be warm enough for my January (now, likely, February!) baby or if I should get fleece ones that are small.  I do have one fleece one my sister got me for Christmas.  Maybe if I add a onesie to his sleeping attire, it will be enough.....it's cold here but I don't think we keep our house too terribly cold....

thoughts? what do you do?