Pssst…. just a note about Nuu-Muu dress size as relative to me.
I am 164cm (5’ 4”) tall. At the time of the photo above (on a cycling holiday in Provence, France, in 2016), I wore a UK size 16 with a bust measurement of 104cm (40-41”) and was wearing Nuu-Muu dresses in size Large. Size XL would also have fit just fine (with a slightly looser, more skimming look) but I prefer a closer fit when I’m cycling all day. As you can see, it looks just fine off the bike for a day of sightseeing, too! I have since sized up to wear XL on a day-to-day basis (not gonna lie… there’s been some lockdown weight gain!), but I’ve personally found the mid sizes M-XL provide a surprising amount of leeway - a range of maybe as much as 2 stone (~30 pounds or 13-14 kg!) If your shoulders are quite broad or narrow, then your comfort zone may be a little more specific. And of course as with anything, “your mileage may vary”, as they say, but I hope my personal experience might be useful! YOU’LL FIND THE FULL OFFICIAL SIZE CHART HERE.