I don't have any during pictures for this.
So I'll just have to explain. I took a soft knit shirt, cut it off at the neckline and cut off the sleeves. I sewed up the holes left from the sleeves and there I had a tube for the main part of the dress.
I took the leftover fabric and sewed it into a tube that was about an inch less wide than my dress-tube. Then I sewed it to the top of the dress tube, stretching it to fit as I sewed.
Last of all, I took the ribbing from the neck of the shirt and cut it up to make straps. Beautiful color, soft and comfy. Perfect for the coming warm season. (Or a cold day, as this day was.)