Generally, the protocol is "appropriateness" except for specific requirements, such as funerals. The funeral requirement is plain white aprons (no "officer" or other such aprons) EXCEPT funerals conducted by Grand Lodge- Grand Lodge aprons may be worn then, as during any other ceremony conducted by Grand Lodge, such as cornerstone levellings, Annual Communications, etc. Here's an example of a Grand Lodge apron:
View attachment 6548
"Personalized" aprons (those with your Lodge's name on them) may be worn when at or representing your Lodge (This would include Tranquillity Lodge aprons). Past Master's aprons may be worn any time except @ a funeral (see first paragraph). Here's an example of a personalized apron:
View attachment 6549
And a Past Master's apron (styles vary):
View attachment 6550
Officer aprons are only to be worn by the
installed officer (
NOT when "pro-teming" in another office) when performing the duties of that office in your Lodge(s).
Hoope this helps!