nicole, you should totally wear it. like you said who cares if youre dressy, youre the bride!
and for me, i am wearing it for sure, our AHR is actually our big freakin wedding, 200 people, the whole shebang. i've been debating on whether to lug my big poofy dress to mexico or just get a lightweight beach-appropro dress instead.
but for you, i would totally do it, i think all your guests will appreciate it as well.