EXHIBIT 23.1 CONSENT OF INDEPENDENT CERTIFIED PUBLIC ACCOUNTANTS Board of Directors and Stockholders G-III Apparel Group, Ltd. We have issued our report dated March 31, 2000, accompanying the consolidated financial statements included in the Annual Report of G-III Apparel Group, Ltd. on Form 10-K for the years ended January 31, 2000 and 1999. We hereby consent to the incorporation by reference of said report in the Registration Statements of G-III Apparel Group, Ltd. on Form S-8 (Registration Nos. 33-45460; 33-45461; 333-81066; 333-51765; 333-80937 and 333-39298). /s/ GRANT THORNTON LLP New York, New York April 25, 2001