Cotton On sweaters (and clothing in general) are pretty comfortable and trendy, but I find the quality and durability is usually pretty bad... I don't buy from there anymore because of the shoddy quality. Even it's extremely cheap prices aren't enough to redeem it.
cotton on have a really chic collection of sweater, they really comfy too!!
This is a bright royal blue cardigan I got for $30 NZD. Adds colour to any outfit!