In case you can't tell, she's a little bit anxious.
Why wouldn't she be anxious? If you've had something as long as she's had her power suit, and lost it, wouldn't you be eager to get it back?
Plus, she's probably pretty eager to get out of Chrono's shirt.
That and the comments by fanboys about her without her suit. Mmmmm, Zero Suit Samus.
Samus probably just doesn't feel right without her power suit, especially considering she has the X and a TerraGaian parasite to deal with, its probably like a security blanket to her. That and I bet Chrono's shirt is itchy.
Well, what would you expect? As far as clothes go, she's used to polyester/wool hybrid clothing, like us. As for the Power Suit, even if it wasn't a security blanket, it's still pretty much a walking armory. I mean, she's got a missile launcher, 4 kinds of beam weapons, a Charge Beam, 2 kinds of missiles, 3 if she's still got the Scatter Missile upgrade from Aether, the Charge Beam Combos, and who-knows-what else packed into a roughly human-sized suit of powered armor that can take a blow that would wreck a tank, a TANK for goodness sake! Who WOULDN'T want something like that!?
George Bush wouldn't, he prefers dropping bombs the old fashioned way :P