Or maybe just more crusty. Astapor is a sweaty place.
Costume designer Michele Clapton created a series of seemingly-identical blue dresses for Daenerys to wear throughout seasons three and four, but if you look closely, you can see that the dresses gradually develop embroidered dragon scales. The differences become obvious when you compare the first and last episodes of the third season:
This is like decorating your tracksuit with your kids' baby teeth.
Meanwhile, Sansa Stark has been hit with more terrible bullshit than anyone else on the show, including being betrothed to the sniveling child tyrant who executed her father and being scuttled away to a mountain tower by a sexually predatory pimp/accountant. In fact, so much crap has happened to Sansa that it's hard to keep track of it all, which is probably why the show's producers decided to sew a pictographic recap of her calamitous journey into the wedding dress she wore when she was forced to marry Peter Dinklage, which is the only legitimately non-horrible thing to happen to her thus far.
Someone forgot to tell her, though
See that band wrapping around her torso? As it turns out, it's stitched with a mind-boggling series of illustrations that, taken together, trace the dominant forces throughout Sansa's life. It starts at the back with an intertwining of fish and dire wolf, which are the respective symbols of her mother's and father's houses.