I agree with James' suggestions, and my answers would depend on whether I was out or not to extended family members.
I would go as me, but might tone it down a bit, ie not suit and tie but slacks and a dress shirt. I should clarify that by saying if I were only recently out, maybe passing inconsistently, I would do that. Now that I'm 2 yrs on T, fully out, and sporting a beard, I would not shave or consider going andro at all. I'd go as me. And if all other men were wearing suits and ties, so would I.
That said, I did go to my BIL's wedding in black jeans, a sweater, and nice work boots (the sweater was feminine; I was not out at that time) when every one else F was in a dress and heels. It was a night wedding in the middle of an ice storm. I was being practical! (and avoiding a dress like the plague!!)
My sister shaved her head (severe buzz cut) right before my father's wedding and she was bride's maid.
I think most weddings have some sort of drama attached, no matter what.
Do what is right for you, even if it means staying home.
Jay