1)
What are "Marvadim"?
1.
Rashi: They are nice bed sheets, like "Marvadim Ravadti" (7:16).
2.
Malbim (Derech ha'Muskal): She made for herself ornaments from ideas that became embodied in her and adorned her.
2)
What is the significance of "Shesh v'Argaman"?
1.
Malbim (Derech ha'Muskal): This is a metaphor for a Chacham's garment, and garments for glory. So are her spiritual garments.