We are not having a lot of OOT guests, and most are family that already know that traditionally in our family evening weddings are floor length gowns and tuxedo black tie/bowtie. Now we have less than a hand full that may not be aware of this and I don't want them to feel obligated to buy or rent a tux. I am pretty sure a dark suit with a black tie/bow tie will be ok for a very formal wedding.
How can I/if I can word this for the wedding website?
I know usually it has been said that the invitation, venue, and TOD dictate the formality, but I just want to make as sure as possible that everyone will be comfortable and not feel out of place/ under dressed.