1)
What kind of Me'il did they wear?
1.
Radak: It was like the Kesones of Bigdei Kehunah.
2.
Radak citing Targum Yonasan: Yonason translates Kardutin, like he translated "Efod Bad" (6:14).
3.
Malbim: They wore a Me'il (robe) over the Kesones Pasim. At the time of Bi'ah, Amnon removed her Me'il, and she wore only the Kesones. When he expelled her, she was not covered with the Me'il.