והסירה את שמלת שביה. לְפִי שֶׁהֵם נָאִים, שֶׁהַגּוֹיִם בְּנוֹתֵיהֶם מִתְקַשְּׁטוֹת בַּמִּלְחָמָה בִּשְׁבִיל לְהַזְנוֹת אֲחֵרִים עִמָּהֶם (ספרי): והסירה את שמלת שביה AND SHE SHALL REMOVE THE RAIMENT OF HER CAPTIVITY — the reason is because these are fine clothes, for the women of the heathen peoples adorned themselves in time of war in order to lure others (the enemy) to unchastity with them (Sifrei Devarim 213:1).
וישבה בביתך. בַּבַּיִת שֶׁמִּשְׁתַּמֵּשׁ בּוֹ, נִכְנָס וְנִתְקָל בָּהּ, יוֹצֵא וְנִתְקָל בָּה, רוֹאֶה בִּבְכִיָּתָהּ, רוֹאֶה בְּנִוּוּלָהּ, כְּדֵי שֶׁתִּתְגַנֶּה עָלָיו (ספרי): וישבה בביתך AND SHE SHALL DWELL IN “THY” HOUSE — [not in the women’s apartments, but] in the house which he constantly uses: when he goes in he stumbles upon her, when he leaves he stumbles upon her (i.e. he cannot avoid meeting her constantly and the novelty of her beauty wears off); he sees her endless crying, sees her neglected appearance — and all this in order that she should become repulsive to him (Sifrei Devarim 213:2).
ובכתה את אביה. כָּל כָּךְ לָמָּה? כְּדֵי שֶׁתְּהֵא בַּת יִשְׂרָאֵל שְׂמֵחָה וְזוֹ עֲצֵבָה, בַּת יִשְׂרָאֵל מִתְקַשֶּׁטֶת וְזוֹ מִתְנַוֶּלֶת (שם): ובכתה את אביה AND SHE SHALL WEEP FOR HER FATHER [AND HER MOTHER A FULL MONTH] — Why all this? In order to make a contrast — that while the Jewish woman (the captor’s Jewish wife) is gladsome, she should be downhearted, while the Jewish woman adorns herself, this one should bear a neglected appearance (Sifrei Devarim 213:5).