The sheets look beautiful. However they should not be called percale. In fact the thread count is a little low for muslin which is usually 150 tc. Percale should be a minimum of 180 tc and 200 or more is better. I am not saying they would not be nice sheets, just trying to help you know better what you are buying.
Hi there. Percale is a stitch - one over, one under - and not related to a thread count. The higher the thread count, the thicker the fabric, of course.