Cal. Rev. & Tax. Code § 6018.6
(a) Any person who received no more than 20 percent of his or her total gross receipts from the alteration of garments during the preceding calendar year is a consumer of, and shall not be considered a retailer within the provisions of this part with respect to, property used or furnished by that person in altering new or used clothing, provided that both of the following apply:
(c) For the purpose of this section: