Mostly, I need something that looks nice, that fits but doesn't look too childish.

Lily flashed him a wide smile, and suddenly she didn't look at all childish anymore.

They actually didn't look very childish because they were all mature early on in a variety of ways.

Short clothes could look too childish, or just too sireny.

Pretending otherwise makes you look silly and a bit childish.

But in appearance she could look quite childish.

Dressed in blue gingham she looked childish this morning.

She never looked less childish than at such a moment, but the very perversity of her expression excited him.

As an adviser, I have frequently counseled students that their language or subject matter might make them look foolish and childish.

His message was half-printed, half-scripted, looking more childish than she would have thought.