PLEASE HELP!!! going to no doubt and have no clue what to wear!?

hi i am a 24 year old female and am going to no doubt this weekend. i need help with options in clothing. don't really want to dress exactly how gwen would, mind you i do love her style! i will be on the floor at the concert. also i am going out after, so im kinda hoping i can find an outfit that i can wear with comfy shoes and then bring some heels to throw on after words.. any suggestions at all would be greatly appreciated! some women are great when it comes to putting outfits together, unfortunately i am not!:(