Ok well I've been freezing in my office so I was thinking of buying a new hoodie and maybe a cardigan. My question is basically if anyone has bought a cardigan do they like it? Is it warm?

I'm asking mostly because as I was looking at the close up photos, it looks like the cardigans are not actually a lightweight sweater knit but are just t-shirt material cut in a cardigan shape. If this is the case I'm just going to stick with a hoodie since t-shirt material has like an almost zero warmth rating :P