Four significant trends are represented by Katy Perry's cut-out see-through dress.

From her classic Vivienne Westwood Coronation costume and highly on-trend bride-meets-mermaid gown for a Tiffany's event to.  

That Kill Bill-style yellow biker jacket, Katy Perry has been providing lewk after epic lewk. She's always been stylish.

But she's recently upped her fashion game, and we're loving it. Katy's costume was the focus of this years.

American Idol finale, and she delivered. The singer and show judge wore an orange. 

Co-ord with cut-outs, a see-through skirt, floral corsages (they're everywhere), and all-over diamanté ornamentation to hit four main. 

Trends at once. See this awesome outfit:Milanese designer Giuseppe di Morabito created the gorgeous two-piece. For £2k (jel).

You can shop Katy's exact ensemble below. Katy pulls off four trends in one thanks to her minimal accessories.

Hair and makeup. It's a "go big or go home" issue since this look is for the finale of one of the world's most-watched series.