This poly webbing harness is designed with adjustable straps to fit just about any size. If a single model fit is desired, the straps can be trimmed easily as is shown here.
The straps pictured here are one inch wide and have a breaking point of 600 lbs. The grouping of four horizontal straps allow the harness to be pulled extremely tight while still keeping it comfortable. If the model is flexible enough, the ankles can be pulled directly down onto the butt, making it extremely restrictive.
The straps are stitched strongly in place and are dually adjustable for optimal buckle placement.
For extra padding on straps, see this listing: