Advice: New Knicks for the C2C (assos Sizing)

Hi Peeps,

Want to get some new high quality bib knicks for the C2C and have been looking at the Assos range (FI Mille S5 Long leg ), obviously great quality but they suggest a medium for my height (175cm) but with a 38inch waist, 26inch thighs and being a 100 kilos im worried these will be too small, dilemma is all my current ones are really too big now and dont want to make an expensive mistake lol.

Have been looking on the Australian Assos website but is there any LBS in Perth that sell them, I assume the price would be much the same as the website is Australia (maybe) or does anyone have any other suggestions but need to get a move on so quick feedback would be apprieciated.

Taa Folks