Do it!: Classic Conundrums

In his closet, Professor Peacock has a box of socks containing 24 polka dot socks and 24 striped socks. Peacock wants to be certain his socks match, but cannot see the patterns since his closet is completely dark. What is the smallest number of socks that Peacock needs to remove from the box in order to be certain of having two socks of the same pattern?