This is the harness to get if you plan to spend any time sitting in one (ie aiding, bolting, etc)

The ultimate big wall, aid climbing harness, the Big Gun is loaded with features to make your long days aiding in the vertical more comfortable and efficient.

• Thermoformed foam bullhorn waistbelt with trad buckle
• Adjustable, removable leg loops
• 7 color-coded customizable gear loops
• 2 color-coded belay loops and 12 kN-rated haul loop
• Left or right holster slots with one hammer holster included
• 660 g

See the second image for size guide