Was told I could not wear my sweater and would be ...

Was told I could not wear my sweater and would be required to wear a collared shirt over my sweater. Looked like a thug at that point. Got to the bar and waited looked to my left and a girl was waiting to be seated in a hoodie sweatshirt with PINK on the front. Ended up walking out. Point being how can a place discriminate a very clean looking sweater and then covering it with a shirt yet have a girl with a hoodie and a backpack get by. Be warned to those found this as a suggestion for sites/todo in Vegas