The Siren dress is the second new dress in Alice: Madness Returns and is seen in the Deluded Depths. Its in-game effect is enemies drop twice as many roses as usual.
The Siren Dress is based on deep sea ocean colors, mythological characters such as mermaids and sirens, as well as pinks based on corals. The bodice appears to be composed of scales. There are lines along the dress that glow in the dark, based on abyssal sea creatures. The apron is in a sea-shell shape and has the astronomical signs of the moon and Neptune embroidered on it (the moon stands for dreams, Neptune stands for water, both can symbolise delusion and deception). Alice's Omega necklace is tied around with seaweed.
The bow on the back of the dress is replaced by an angler fish, with spines fanning out and an angler fish's lure which also glows in the dark. Alice's hair also flows to the rhythm of water and her gothic boots are removed, rendering her barefoot. Her make-up has also changed and her lips are now the same pink as her dress.