A cute, unique way to ask a guy to Sadie Hawkins (Sadies)?

The guy I'm going to ak has been my friend for months now and we recently started dating. Even though we are dating, I still want to ask him. I'm up for anything. I'm 100% sure he'll say yes. BTW, our LAME theme is Wild Wild west, if you have any outfit ideas I'd love it if you can give me some(: Thanks!