I play on the PS3. My wife Ysolda is always wearing the same ugly dress. How can I change her clothes?

She came up to me one time and said something along the lines of "Excuse me, I noticed that you dropped that armour, if you are not using it, can I have it?"

I said okay and she walked up to a mannequin but she just stood there. How do I get her to wear armour, hammerfel garb, foresworn armour, anything?

You'd have to be on PC, like I am on 360 you are stuck with her default clothing. It would be nice to dress your spouse up or down as you would like if you know what I mean. But alas she will never 'change'

You don't.

I'm surprised that the option wasn't given with Hearthfire.