Willow realizes her wardrobe does not project the right image in "The Body 5ABB16":
WILLOW
No, I think... I should wear the purple,
I think the purple, it's just that
it's so, I don't know... it doesn't
mean something bad?
TARA
I think it's royal. Purple means royalty.
WILLOW
Well I can't see Buffy at the morgue
and be all royal! "Oh, I'm the king
of everything, I'm better than you..."
(tearing up again)
I have to be supportive, Buffy needs
me to... why do so many of my shirts
have stupid things on them? Can't I
dress like a grown up, can't I be...
be a grown up...
After this, her wardrobe seems to be a little less juvenile, although she never becomes stylish. But that's OK, it's Willow.