At last year's Grammy Awards, all anyone could talk about was Pharrell's huge hat. This year, the winner for most outrageous look is kind of a toss-up: we've got Sia in her cape and wig, Rihanna in a poufy Giambattista Valli number [1], Ciara channeling a loofah [2], and Madonna rocking a glam matador getup [3]. (Side note: it may be a one-name thing.) So it's up to you. Take a look at all the out-there outfits below and then tell us which star you think wore the kookiest look at the 2015 Grammy Awards [4].

Sia

Rihanna

Ciara

Madonna

Image Source: Getty [5]