Need help on wedding outfit!!!?

I will be going to a wedding as a guest at a church. I'm young and I think this dress fit my age. Is this a nice dress for a wedding guest?? Is it too simple?? Plus I'm short so the dress is not long in the middle of my thigh, it's around my knees (navy blue). http://www.express.com/ruffled-halter-dress-26333-22.pro?Mcat=22&Mcatp=cat_2&Mpos=3&Mppg=0&Mcatn=Dresses+%26+Jumpsuits&Mcatpn=category&Mpg=SEARCH%2BNAV&Mpper=3&user_att_name=Interest&user_att_value=Email&Mrsaa=*&Mrsavf=*