To wear clothes stylishly; to pull off an outfit so it looks good on the wearer.
彼女はどんな服でも器用に着こなす。
She skillfully pulls off any kind of clothing.
そのモデルはスーツを見事に着こなしている。
That model is wearing the suit superbly.
新しいコートを買ったが、まだ上手に着こなせない。
I bought a new coat, but I can't quite wear it stylishly yet.