My first print in ABS and it came out great with the below settings. I used meshmixer (also for the first time) to remove the logo and it left it smooth. I'm a 31" waist and used the 814 mm and scaled it down to 97% and changed the Z to 33 mm which left it perfect or a bit snug. I would recommend adding 1 to 2 inches to your pant waist size and scaling it for that since there are 5 links on the end for different sizes (each about an inch apart).
black abs, layer height 0.2, initial 0.3, line width 0.4, 3 walls, 3 top/bottom, hoizontal expansion -0.15, 10% infill, temp 235/105 on naked glass build plate, speed 50, inf speed 35, wall 25, retr 6, retr speed 50, fan speed at layer 5, brim 2 layers, coasting enabled