I can't tell if it's because she's that comfortable around him in dishabille, or that she's pulling a Haruhi and sees it as like undressing in front of a sack of potatoes.

Kryptik said:

I can't tell if it's because she's that comfortable around him in dishabille, or that she's pulling a Haruhi and sees it as like undressing in front of a sack of potatoes.

Probably the former as she believes he wouldn't cross the line in any capacity. She's not even worried he'd sneak a quick glance.