Volume 6, Book 60, Number 203:
Narrated Muhammad bin ‘Abbas bin Ja’far:
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SAHIH BUKHARI VOLUME 6 > BOOK 60: PROPHETIC COMMENTARY ON THE QUR’AN (TAFSEER OF THE PROPHET (PBUH))
That he heard Ibn ‘Abbas reciting: “No doubt! They fold up their breasts.” (11.5) and asked him
about its explanation. He said, “Some people used to hide themselves while answering the call of
nature in an open space lest they be exposed to the sky, and also when they had sexual relation with
their wives in an open space lest they be exposed to the sky, so the above revelation was sent down
regarding them.”

Volume 6, Book 60, Number 204:
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.”