Having specified the top and the under-garments, why does the Pasuk continue "be'Meh Yishkav"?
Rashi and Targum Yonasan: To include the bedspreads.
Mechilta: "Kesuso... Simlaso l'Oro ba'Meh Yishkav" includes all Kelim. 1
Hadar Zekenim: I command you to return it to him, for in what will he lie?!
It is not clear however, why the Torah needs to mention all three, (EC)
What are the connotations of "v'Shamati Ki Chanun Ani"?
Ramban: It teaches us that if someone cries out to Hashem with all his heart, Hashem listens to his cries, even if he is not worthy. 1
Rashbam, Riva citing R"M of Kutzi: Strictly speaking, the creditor has a security (which he owns). His obligation to return it is Lifnim mi'Shuras ha'Din (beyond the letter of the law), in which case, when the creditor fails to return it, Hashem ought to ignore his cries. And it is only because Hashem is gracious that He answers him. 2
Seforno: Even though the poor man has no basic claim against you, since he borrowed from you and owes you money, Hashem will listen to his cries because you left him without clothes, following which He will deduct part of the extra money with which He graced you to provide others less fortunate than yourself, and give it to him. 3
Moshav Zekenim #1: I (Hashem) am gracious. Also you should be gracious and go beyond the letter of the law, and return his security!
Moshav Zekenim citing R. Asher: Do not say, I will not take [for a security] a Tzadik's garment, but I will take a Rasha's garment. I (Hashem) am gracious, and I hear the cries of everyone!
Moshav Zekenim #2, Da'as Zekenim #1, Hadar Zekenim #1: When the Oni will scream 4 to Me about the good that I did to him - "v'Shachav b'Simlaso u'Veracheka", I will hear him, and bless you.
Hadar Zekenim #2: I (Hashem) am gracious, and I do not want you to pressure him too much. If you want to collect from him based on the letter of the law, also I will collect when you are liable to Me! 5
Because 'Chanun' is a derivative of the word 'Chinam', implying that when one supplicates to Hashem, He responds with a Matnas Chinam, irrespective of one's credentials (See also Rashi at the beginning of Va'eschanan).
Rashbam, Riva: As opposed to Pasuk 22, in connection with an Almanah and a Yasom, where the Torah does not use the Lashon "Chanun" - because they cry out to Hashem min ha'Din.
You are therefore well-advised to return him the security in its time, thereby ensuring that Hashem continue to grace you with the extra money to continue providing those in need.
Hadar Zekenim, Da'as Zekenim: The Oni's cry is 'I was created in Your form like him - he lies in comfort in his bed, and I do not have what to lie in!' However, this is difficult, for we do not find "Chanun" for evil.
Rashi writes that here we discuss a day garment, Why does it say "ba'Meh Yishkav"?
Moshav Zekenim: The previous verse teaches a day garment, and here it teaches a night garment. Even though (Devarim 24:13) "Hashev... v'Shachav b'Simlaso" teaches a night garment, that is needed to teach that the lender acquires the security - "u'Lecha Tihyeh Tzedakah."