Narrated Muhammad bin `Abbas bin Ja`far:

Ibn `Abbas recited. "No doubt! They fold up their breasts." I said, "O Abu `Abbas! What is meant by "They fold up their breasts?" He said, "A man used to feel shy on having sexual relation with his wife or on answering the call of nature (in an open space) so this Verse was revealed:-- "No doubt! They fold up their breasts."

Narrated `Amr:

Ibn `Abbas recited:-- "No doubt! They fold up their breasts in order to hide from Him. Surely! Even when they cover themselves with their garments.." (11.5)