what does one wear to a memorial tea party?

[lauradi7dw]

Instead of a memorial service per se, the stepdaughter of one of the members of the knitting group (who actually didn't knit - she did fantastic needlepoint galaxies, for example) is hosting a tea party to share memories (and tea, probably, but I'm not going to take off my mask). How formally do I dress? Black skirt and white blouse? It will be my 4th activity tomorrow, after Tai Chi, ringing, and a Pumgmul session (which I will leave early), so I need something that will not be messed up by packing it.