After you marry Lydia, she will say that she opens a new shop to make small profit. bring her as your follower, make her wear other heavy armor, such as ebony, then make her leave. immediately after that see what she have for sale, she will still be wearing the ebony and her default steel armors will be available for sale. buy all those and keep it else where. sometimes she have more than 3 similar armors. after that trade back the ebony armors from her. and she will be naked. give her anything you would want her to wear. i gave her vampire lord armor. she looks smexy. this works with console too. providing you have married lydia. good luck. :3
