If you'd prefer not to do that (but think -- you actually have an excuse!), I think black is okay. Today, especially for evening weddings, black is nearly always acceptable. It looks a bit tacky in the afternoon (especially outdoors ... in the summer ... but let's not dwell on my family ...), but for an evening wedding? Especially with a quiet dinner at a restaurant afterwards? Black is fine.
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If you'd prefer not to do that (but think -- you actually have an excuse!), I think black is okay. Today, especially for evening weddings, black is nearly always acceptable. It looks a bit tacky in the afternoon (especially outdoors ... in the summer ... but let's not dwell on my family ...), but for an evening wedding? Especially with a quiet dinner at a restaurant afterwards? Black is fine.