May be a black suit with yellow tie would go perfect with your girl friends dress. Or a Yellow t-shirt with blue jean would also go good.
Try the color which suits you the most and wear that.
A black is always classy. You can incorporate yellow shoe laces with your dress shoes or a yellow tie or dress shirt. You can even throw in a pair of yellow socks or yellow cufflinks.
I would say just go with a standard black or white suit but wear a tie that matches the colour of her dress and maybe a shirt of the same colour but a MUCH lighter shade.
first ask your girl friend about her best color............... if i were u i would use lack suit
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