I actually mean something specific when i say dad jeans - they're jeans with that shapeless look particularly around the ass, loose leg, usually with extra material pooled around the ankle. For extra dad cred, wear with a black dress belt
Saying it a different way, those jeans will only look great if they fit great. I guess you'll see when you get them.
RRL is made to a much higher standard than Polo. Think more of a casual Purple Label. At that price i might have gambled on a pair or two if they had a more normal, less distressed wash