I’m not convinced with the sizing quoted here, I have a 34”-36” waist (season and pie dependant!) and find that the XL is the most suitable size due to having longer webbing on the main straps to grip when tightening it up.
Having the luxury of trying the Large also, whilst it fits, I feel that it does not have long enough webbing straps to give me enough extra to grip to tighten.
Also the Large quotes 31” on the harness itself while the XL says 33” which is totally different from the sizing chart. From persoanl experience, I’d be inclined to go with the sizing on the harness itself.