Look at page 15 of this 27 page
$1 I was given this by email when I onboarded in January 2021, just 7.5 months ago, yet people here have been telling me it's outdated. There is a much shorted Dress Code out there too that does not have the t-shirt prohibition. Add to that the rules/restrictions imposed by DMs and SMs that may be even narrower than this or the SMs like mine who are pretty nice and liberal within reason and we're kind of all over the place.