I figure it's kinda like fighting a mirror without the broken glass. Well, actually I think the boys are just getting to know each other's fighting styles before any real exchange of blows can happen. Poor Watsons are just venting some frustration. Since I designed Joan a new jacket to go with her outfit, I thought I'd change her hairstyle as well. If you think her outfits are getting more anachronistic, think of it as some the TARDIS's residue energy bending the clothes around her to suit her modern tastes. As to where she got the jacket from, I'm sure RDJ Sherlock has a well stocked wardrobe for any occasion; including time traveling ladies in need.