I need to add something to my website about how guest should dress to my wedding. For some guests, this will be their first Indian wedding. I want everyone to dress very formal. I want men to be in dark suits, but not necessarily tuxes, and all women should be in floor length gowns. And obviously, any formal Indian attire is appropriate. Would I write "black tie/Indian formal attire is requested" or "black tie optional/Indian formal attire is requested".
I guess my confusion is that black tie optional gives men the option of not wearing a tux and just a dark colored suit, which I'm fine with, but doesn't it also given women to wear short dresses (which I don' want)?