Just found out that two of the three weddings on our calendar come with the request that guests wear black. (One of these will have a "wear white" event the evening before. I've got that covered.)

I've never attended this kind of wedding before and have no idea what is proper. Would it be okay to wear some black with say a print of another color?

Does the request apply only to dresses/evening outfits? How about accessories? Could I wear say, blue or red shoes?

The first wedding will be of a family member who is marrying for the first time at middle age. She is a fashion designer, so I'd like to wear a somewhat fashion-forward outfit. Her partner is also in the fashion business but we haven't met her. The wedding will be early evening at a resort in Rhode Island.

Currently I don't own a black dress, (not one that fits, anyway) but I can wear the same one for both weddings.

I will be grateful for any ideas on how to proceed or guidelines and possible outfits.