Thanks - I don't think that helps because the inch measurements are apparently just a little wider than the centimeters. I would definitely try one on if I knew a place that had them, or an online retailer that has easy returns, but I couldn't find any. Their "find a store" page is completely useless, it lists some businesses that either don't exist or have nothing to do with selling diving equipment, and the ones that do exist mostly only have their neoprene socks in stock I'm reluctant to buy it from the official website, sounds like they ship everything from the UK so I would not be able to get back the VAT and import taxes if I have to return the suit.The Fourth Element size chart has incorrect conversions from Inches to Cm. Not sure if that helps or not in your case.
If possible I’d definitely try out a Proteus II Small Tall. I’m 187 cm, 85kg and the Large fits me very well. The arms and legs are very slim cut and take lots of pulling to get on my skinny limbs. The ankle and wrist seals are tight and the uniquely designed neck seal cuts down on water circulation big time.
The other bit of equipment I always recommend to purchase rather than rent is a computer. Makes you an independent from the guide and is very easy to pack.