Be sure to look through our group costumes to see what else we’ve come up with and hopefully it’ll give you some inspiration. Another fun idea would be to pick a color and base all your costumes around that, or pick separate colors for a rainbow-themed costume group. When it comes to Halloween, the sky is the limit! When it comes to style, the British high street giant has seen increases in searches for a number of period-appropriate outfits, including silk dresses (up 63 per cent) and corsets, yellow power ranger costume which have seen a 20 per cent rise.