Actually, looking at the pictures, maybe I should fear horizontal stripes. Yes, they definitely do make me look fat but I don't care; it's comfy and kinda cute and I love it anyway.
I spotted this polyester knit fabric at Walmart. I don't often buy fabric there but I always look and once in a while they have something nice. After I got it home my original plan changed. For some reason I suddenly just had to make it with integrated sleeves. I'm very happy with that choice.
I have actually worn it in public once. (gasp!) I think it looks pretty good with this very old velour jacket.