First, there were SEVENTY t-shirts in the duvet cover. And, quickly, rushing, but as promised, here are the pants I made:
My one mistake was to sew the casing closed prior to making the buttonholes. Next time: make buttonholes first! Then sew casing shut.
And, BTW, I had a Linen Bonanza at my favorite thrift store a couple of days ago. This top was found then.