There are 3 jackets, 2 pants, and 1 skirt, how many different matching methods are there to make a suit of clothes?
有3件上衣、2条裤子、1条裙子，要配成一套衣服有多少种不同的配法．
<gadget id="calculator">3 * 1</gadget>
<output>3</output>

<gadget id="calculator">3 * 2</gadget>
<output>6</output>

<gadget id="calculator">3 + 6</gadget>
<output>9</output>

<result>9</result>