וַתָּ֣קָם וַתֵּ֔לֶךְ וַתָּ֥סַר צְעִיפָ֖הּ מֵעָלֶ֑יהָ וַתִּלְבַּ֖שׁ בִּגְדֵ֥י אַלְמְנוּתָֽהּ׃
Pagkatapos ay tumindig siya at umalis; inalis niya ang kanyang belo, at isinuot niyang muli ang kanyang mga damit ng pagkabalo.
Sforno
ותלבש בגדי אלמנותה, because she was no longer willing to be married, seeing that she had achieved her purpose and was with child from the man whose seed she wanted to perpetuate.
Radak
ותלבש, her conduct proves that she had no intention of becoming pregnant by anyone other than Yehudah. Many women of that period had an overpowering desire to somehow be impregnated by the sperm of Avraham the patriarch, even though it might have been diluted with other genes. Being biologically connected to Avraham was an important status symbol.