Inspiration for jumper or cardigan if cut down the middle? And I might cut up and lengthen the inner sleeve seam, this creating more of a side seam at the same time so it's not quite so revealing on the sides.
DIY knicker/pants/undies tutorial This concept/pattern would be easy to convert to fit a plus size adult - and how perfect this is to create knickers that accommodate a big belly, wide hips, or a larger butt.
Tutorial for sewing your own knickers (panties). I love this as I prefer full coverage knickers but they are usually only available in granny styles. Now I can make them in stretch lace and all kinds of pretty fabrics.