Artist's commentary
"Kancolle" Rubber [Lover] collection (My Lover [Rubber])
1. Yep, if it's summer, it's got to be swimsuits. As such, it's rubber. As for me, rubber is a second skin. There's no trouble.
2. Yep, this is perfectly me.
3. This is an illustration of a costume where the fabric, like body paint, will stick to the inside of a hole while covering it such that even the navel is visible.
The words "lover" and "rubber" sound identical in Japanese, so I'm pretty sure there's a pun intended here in the title.