Ignore your date. Wear a pink boutonniere instead. Or a pink shirt. Pink shirts are awesome, as long as you don't get them from any store that rhymes with "Hex dress." The neon pink isn't what you want.
If you must wear a pink tie... actually, I'm having a hard time finding a pink tie that I like. http://www.samhober.com/grenadine-grossa-solid-silk-ties/pink-silver-grenadine-silk-tie-25.html This, maybe?
i can't think of a pink tie combo that i truly like and is formal enough.
if i wore a pink shirt what would you suggest for a tie and suit colour? i find it hard to think of something that is formal enough again.