In 30 odd years of wearing thongs everyday I have worked as a mechanic, builder working my way up to being a carpenter and then project manager, there was a level of informality with these jobs that allowed for thong slips and for people to know which quite a few did, especially in the 90s when really none care who wore what. For the last 5 years i have worked for a national company at management level i have been much more careful as I would not want anyone to know, I think attitude towards men in thongs has changed as well and not for the best.