Combination Notation

Anna is planning a trip to Europe for a week and plans on bringing home a lot of souvenirs. In order to have space for these souvenirs Anna needs to pack light. Anna also wants to be sure she has plenty of options for outfits. If Anna brings $7$ shirts, $3$ skirts, $4$ pairs of pants, and $5$ pairs of shoes, how many possible outfit combinations does Anna have? (Hint: when choosing a skirt or pair of pants they can be combined because Anna can only wear one at a time).