Related to forum #66409, I'd like to start a discussion on this topic. There are a few tags that I think should all have implications to underwear, and some opinions that may or may not be shared by all but that we should probably have a policy for.
First of all, currently the underwear tag is unused. It used to be aliased to lingerie, but in my opinion they are distinct--lingerie is underwear, but not all underwear is lingerie. So we've undone this alias. However, now there's a good opportunity to populate this tag with something sensible.
In my opinion, underwear is basically panties, bra, and any fancy lingerie like a chemise, though this kinda falls apart at stuff like a nightgown, which you'd still probably wear with panties at least.
So I think that the following implications should be made:
bra -> underwear
panties -> underwear
underwear_only -> underwear
And these ones are still up for debate:
lingerie -> underwear
chemise -> underwear
And others that I may have missed.
Updated by MyrMindservant