I made two pairs of high waisted shorts with a pattern I made based off some of my own shorts that fit well. They only needed 1/2 yard of fabric each (I spent about $4 in total) and were super quick and easy to make. As a guide, I used this video from Q2HAN on YouTube which is really helpful and thorough. The materials I used were 1 1/2" elastic (about 13" for one pair), 1/2 yard of a thick knit material (mine isn't very stretchy), and buttons. My shorts are approximately a size small for reference.
To start, I first made a pattern from some cotton shorts folded in half, leaving about an inch for seam allowance and to adjust the fit. The second time around, I adjusted the pattern slightly based on the adjustments I made to the first pair of shorts. The pattern for the back half should be slightly wider, and the crotch part should be extended about an inch.
With the a curved rectangle lined up with the cutout on the short front piece, I sewed them together and turned it right side out and top stitched. Then I sewed the back of the pocket on, matching up the rectangles.
At this point the shorts can be tried on to determine how long you want them and if the sides need to be taken in. I hemmed the bottoms by folding the edge up twice.