Khaled El-Qazzaz, the former president's secretary for foreign relations, and top adviser Essam El-Haddad made the request in telephone conversations last Friday, their relatives told AFP.
The military, which overthrew Morsi on July 3 after mass protests demanding his resignation, faces international calls for the ousted Islamist leader's release.
It has refused to disclose his fate, and that of nine aides held with him, or their locations.
In a news conference yesterday, Morsi's relatives said they have not been allowed any contact with the deposed president and that they intend to sue the military for "kidnapping" him.
The last contact was made on Friday, when Qazzaz called his home in Cairo and Haddad called his wife, relatives said.
"He called up his home and said 'I want white clothes,'" said Mona El-Qazzaz, his sister.
Prisoners awaiting trials or verdicts in Egypt wear white clothes, which may be provided by family members. They are issued blue uniforms after sentencing.
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