AIBU or is this completely pointless - dress code on the invitation says morning dress or lounge suits for the men, traditional and hats optional for the woman. Isn't this a bit unnecessary to put on a wedding invitation, what the hell were they expecting their guests to turn up in, had they not included that guidance? 
FWIW, because I know you love these details on a wedding thread, it's a no kids wedding, and they politely asked for money but not with a poem.