Since Yisrael borrowed the Egyptians' vessels, why did they not return them?
Or ha'Chayim: Refer to 3:18:3:1.
Seforno: When Part'oh attacked Yisrael at the Yam-Suf, Yisrael acquired the borrowed objects as spoils of war. 1
Rashbam, Da'as Zekenim, Hadar Zekenim: In fact, they did not borrow the Egyptians' vessels at all; they asked them to give them as gifts. 2
Measure for measure - since the Egyptians came to kill Yisrael and to take their possessions as spoils, Hashem killed them and Yisrael took their possessions as spoils (Seforno).
Seeing as the Torah writes in Bo that Hashem placed the favor of the people in the eyes of the Egyptians" (Rashbam). They gave willingly, amidst fear of the Makos (Da'as Zekenim, Hadar Zekenim).
Why did Hashem instruct them to ask specifically for silver and golden clothes (Rashbam) and women's clothes?
Rashbam: In order to dress their sons and daughters respectfully in honor of the forthcoming Yom-Tov. 1
Matan Torah - Shavu'os. See also Ba'al ha'Turim.
What is the meaning of "Vayenatzlu es Egypt"?
Why were women commanded to ask from Migras Beisah, but not from Megar Beisah (a Mitzri living in her house)?
R. Yehudah ha'Chasid: No Yisrael would allow a Mitzri in his house 1 , lest he be secluded with his wife or rape her, or lest she desire him, and this will spoil the [Yisrael's] children from his wife. One can have a Mitzris in his house. His wife will guard against seclusion, and he can guard himself from desiring her.
This is also the intent of Moshav Zekenim, but there is a printing mistake.