its okay to look nice.. its okay to be excited n wha not.. buh dun let ur mind stray away from the real importance.. wear wha u wanna wear, buh i wud suggest dun get 'decked' out, be modest, be 'simple'...
jus remember on the wedding day that i's nah really about 'you'... its about your Guru.. the reason we do laavaa is because we're askin Guru Sahib for blessings and telling Guru Sahib that from that moment on, u and ur husband/wife will work together as one Soul to advance ur Gursikhi Jeevan etc...
u dun wanna get to a point where ur thinkin more bout wha ur wearin, rather then askin ur Guru for blessings...