From the cradle to the coffin underwear comes first.
In my hand luggage I always have my camera, iPod, make-up bag, tooth brush, cleansing products, clean underwear, socks and a change of clothes in case anything goes missing at the other end - and of course my passport.
I used to carry a copy of Ulysses with me everywhere just in case I was knocked down by a bus. It seemed more important than having clean underwear.
I love a man who can wear my underwear.