It's not necessary to spend $100 a month on clothes, but every now and then a new shirt or clean underpants won't hurt. It'll give her a new perspective on you and helps her notice you (if you know what I'm getting at)! My husband once wore an old fashioned shirt as Dracula for halloween and it drove me ape shi*t. A little bit of class or even a collared shirt in a color you wouldn't normally wear without pointers is really all you'd need to feel like a new guy