I sewed View A in size medium for my DH using cotton shirting fabric I bought at Joann's. Very easy to sew using clear pattern instructions included in the envelope. I used french seams on the front and crotch seams. I did flat fell seams on the side seams for a nicer look and to work with the side vents. Added a bar tack at top of each pleat for reinforcement.
This pair requires only three pattern pieces so I was initially concerned about the fit as his RTW boxers have five pieces. DH says they are very comfortable and would like more pairs.
I did not put in an open fly as DH as says, ahem, he doesn't need it.
For elastic, I used Stretchrite sport elastic in 1 1/4" width. Very similar to the elastic DH likes in RTW boxers. I covered the cut edge of elastic with twill tape for a cleaner look.