If we're re-stating love for previously mentioned guitarists, I feel honour bound to give you this picture of Ritchie Blackmore demonstrating probably the greatest contrast of really gimpy costume versus really sick chops in history:

Seriously, you
need to have written Smoke on the Water to get away with that.
Also, I want to expand this thread. Favourite stringed instrumentalists! Where else will I get to show my love of Georgina Biddle, Fiddler extraodinaire and the Skyclad member with the most amusing hair:

Edit:
And also, because I was keeping to pictures of guitarists with guitars before:

DAN MOTHERFUCKING SWANO (Altar, Another Life, Bloodbath*, Brejn Dedd, Canopy, Diabolical Masquerade, Edge of Sanity, Godsend, Incision, Infestdead, Karaboudjan, Katatonia*, Maceration, Masticate, Moontower, Nightingale, Odyssey, Overflash, Pan.Thy.Monium, Ribspreader, Route Nine, Star One**, Steel, Total Terror, Unicorn, Mahlstrom, Sorskogen)
*/** One starred he only did drums for, two starred he only sang for, but damn they make the list look cooler. This man can slay on pretty much any instrument.