The worst... well, Tingle from LoZ is a given. I'm also gonna go with Claudia from Silent Hill 3. I get that she's like the cult leader, but jeez >_> Did her clothing really have to be so blatantly cult-like?
Anyway, another, well, not so much bad, but not so greatly dressed character would be Tidus from FF. Annd.... hmm, I'm sure there's more I just can't think of right now.
But as for best dressed, I'm gonna go with Midna's human form--that get up she had on was beautiful. And then there's Heather from Silent Hill 3, she looked cool, and same goes for Claire Redfield from RE. I also think Mia and Jenna from Golden Sun looked pretty cool, as well as Candice from Pokemon and, oh, yeah, Nami from Harvest Moon =3