Bib sizing. Lusso sizing is probably on the mark for me in a L but they are a loose fit I would say, however if you go to the European makes such as Sportful, Nalini or Exteondo i`m an XL it would seem and even then they are nipit. I go buy waist size which seems about right in bibs. Jerseys/Jackets as above and defo an XL for most, chest size seems about bang on for me.