Ok, so I wasn't sure where I should put this, but I guess its fashion.
A little background first, because i'm cool like that

I officially have my first BF as a girl!

really exciting! Well, we've been dating for a bit now, and he's in college, he knows i'm a t-girl and is fine with it. He asked me to a formal dinner/dance at his college *its something his fraternity or w/e it's called does every year* Well key word, formal, I'm not too far along in transition, getting close to starting my forth month on hormones.
I've never worn a dress, i've always kept my look blendy, nothing flashy or extremely eye catching and what not. Soooo, first question to the more experienced t-girls *t-boys with fashion tips, or anyone for that matter feel free to answer lol* I am aware there are dresses that isn't like cleavagy showing, considering I have what my friend calls AA's, I can't really wear anything like that. Are there that many in the more adult age ranges? that are still cute looking, and formalish? I figured it would be more likely in the younger ages since they too don't have anything to show

if so, where to shop? is ross good for that? Or should I go some where else?
Next question, color, so far a lot of people have said baby blue, pink, manily pastel colors because i'm pretty pale skinned, a lighter brown/dirty blonde *i'm going to have blonde highlights tuesday so it will change* and blue eyes. I'm going to change my picture, i'm sure, maybe you can see my face more up close in it and get a better idea of my skin ton and what not.
*****WARNING MATURE CONTENT****Lol sorry I kind of wanted to give warning, I know some people are sensitive, and I won't be too graphical or anything, dont' want to offend anyone. I'll keep it as discrete as I can

Last question... the sensitive one

. Ok obviously a dress and err.. male anatomy don't go hand in hand, I'm sure we all know about random... excitements, just from heck who knows wind or something. luckly thats not too bad now being on hormones, noticed a difference. This is where it gets a tad personal. I'm the type that is lucky when hmm... not excited, I don't really have to tuck, and because of hormones I'm not worried about randomness, but you never know. So my question, should I just be extra careful and do some kind of actual tucking, i'm horrible at doing it, tried tape and what not. or is it possible to just idk, wear two layers of tight undies?
I'm just kind of worried I'd be dancing with my bf, and bam! a bulgy dress isn't prolly cute on a girl

anyways any help will be much appreciated! thanks.