13D Filing: Red Mountain Capital and Destination XL Group Inc. (DXLG)

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Exhibit 3

Destination XL Group, Inc.

555 Turnpike Street

Canton, MA 02021

April 4, 2018

Red Mountain Capital
Partners LLC

10100 Santa Monica Boulevard, Suite 925

Los
Angeles, CA 90067

Re:	Destination XL Group, Inc. (the Company)

Reference is made to:

1.    the Restated Certificate of Incorporation, as amended (the Charter), of the Company; and

2.    that certain letter dated March 11, 2013 from the Company to, and countersigned by, Red Mountain Capital Partners LLC
(Red Mountain) regarding the ownership of the Companys stock (the 2013 Waiver Letter);

3.     that
certain letter dated January 29, 2014 from the Company to, and countersigned by, Red Mountain (the Standstill Agreement); and

4.    that certain letter dated December 23, 2014 from the Company to, and countersigned by, Red Mountain Capital Partners LLC
(Red Mountain) regarding the ownership of the Companys stock (the 2014 Waiver Letter and together with the 2013 Waiver Letter, the Waiver Letters)

Unless otherwise noted, capitalized terms used herein and not otherwise defined herein shall have the meanings ascribed to such terms in the Charter.

Subject to the restrictions contained herein and your execution and return to us via email of a copy of this letter, the Company hereby authorizes, in
accordance with §4.3.2(b) of the Charter and paragraph 5 of the Standstill Agreement, Red Mountain and its Affiliates to increase their aggregate Percentage Stock Ownership interest in the Corporation up to an aggregate of 17.12% of the
outstanding common stock of the Company from the 15% ownership level previously authorized by the Waiver Letters and paragraph 5 of the Standstill Agreement. All other terms of the previous Waiver Letters and the Standstill Agreement remain in
effect and are not otherwise amended by this authorization. For the avoidance of doubt, as set forth in the Waiver Letters, the Percentage Stock Ownership interest in the Company held in the aggregate by Red Mountain, its Affiliates
and any other person affiliated with Red Mountain may also increase from the 17.12% threshold up to 20%, but only to the extent such increase is achieved through (a) compensation paid in Corporation Securities to Willem Mesdag pursuant to the
Destination XL Group, Inc. Third Amended and Restated Non-Employee Director Compensation Plan (as may be further amended) and/or (b) a reduction in the number of issued and outstanding shares of common
stock of the Company. Any Transfer that is not permitted under the terms of the Waiver Letters, the Standstill Agreement and/or this letter shall be a Prohibited Transfer under the Charter, and the Corporation Securities that are the
subject of any such Prohibited Transfer shall be Excess Securities under the Charter.

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