The bulk update request #12403 is pending approval.
create alias unbuttoned_shorts (174) -> open_shorts (800)
create alias unzipped_shorts (170) -> open_shorts (800)
create alias undone_shorts (3) -> open_shorts (800)
create alias unbuttoned_pants (802) -> open_pants (8277)
create alias unzipped_pants (1310) -> open_pants (8277) # has blocking transitive relationships, cannot be applied through BUR
create alias undone_pants (0) -> open_pants (8277)
Reason: I don't think it much matters how the shorts are held closed, and people are using the tags interchangeably anyway.
EDIT: Oh I guess I should include pants too, derp.
Updated