I hand sew semi-traditional kilts using 5-6 yards of woolen tartan. Compared to an 8 yard kilt, there are fewer pleats and they are a bit wider. The sewing time is a little less because of fewer pleats, but otherwise I sew it the same as for a traditional 8 yard knife pleated kilt. I do pleat cut-outs, steeking, waist stabilizer, canvas, lining, belt loops, buckles and straps.
If it's a 4 yard casual kilt, there would be even fewer pleats and the pleat width would be wider. I wouldn't do cut-outs and would probably not do a buttonhole for the underapron strap. Instead, I'd do an inner buckle as done on 4 yard box pleated kilts. If wanted, I could do a velcro closing.