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I'd definitely go medium, I'd be skeptical that small would stretch that long. I'm 177cm, 30in waist and ~72 kg and a medium fits fine - no flapping or anything, so I don't think you'll have an issue with that. Can take photos later if you want
Also, quoting 6pt
I'm 188cm/6ft 2in. The Medium skinsuit fits me perfectly at 78kg … I would say I was at the upper end of the height range for an M though.
190cm and 73kgish. Usually wear a small top and 30inch shorts