Yeah, Akira Noda is her costume director (and has been since the beginning), so most/all of the outfits she wears for concerts/CD jackets are made by him. I'd always thought he was a she because there'd be the skinny woman with glasses in the DVD footage when Ayu would do fittings, but I guess she's probably a second-in-command or something.
http://jfw.jp/en/about/keyvisual.html
The top left outfits that are designed for the 'hands' wearing them really remind me of Ayu concert outfits, haha. [They're Akira Noda works.]
I kinda wish she'd do a special collaboration with a super high fashion label for a concert, but I guess those will be CD jacket/magazine only. Oh well...