What to wear??

Help my birthday is on Saturday and my boyfriend is taking me out that night. I have no idea what to wear because it’ll be 50° and raining. Any ideas? It’s a nice place. I thought about wearing a denim skirt but is that acceptable when it’s cold? Lmao. (I don’t need the “girl you wear what you want don’t listen to other people’s opinions” it’s nice to hear that from people however I need a real answer lmao)