EXHIBIT 32.1

CERTIFICATION

In connection with the Annual Report of Stitch Fix, Inc. (the “Company”) on Form 10-K for the year ended July 28, 2018, as filed with the Securities and Exchange Commission (the “Annual Report”), we, Katrina Lake, Chief Executive Officer of the Company, and Paul Yee, Chief Financial Officer of the Company, each certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that, to the best of our knowledge:

1. The Annual Report fully complies with the requirements of Section 13(a) or Section 15(d) of the Exchange Act; and

2. The information contained in the Annual Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

Dated: October 3, 2018

/s/ Katrina Lake

Katrina Lake

Founder, Chief Executive Officer and Director

(Principal Executive Officer)

/s/ Paul Yee

Paul Yee

Chief Financial Officer

(Principal Financial and Accounting Officer)