Amazon EssentialsWomen's Lightweight Open-Front Cardigan Sweater (Available in Plus Size)

Is this similar to a t-shirt material, or a heavy sweater material? I'm looking for something to wear around the house, so I need something comfy.

is this like a sweater knit or smooth?

what is the length of this cardigan, in inches, for XL size?

I normally wear medium, what size should I get? I am 5'6", 140lbs