Channel those retro vibes as tie dye is making another comeback this year as one of the easiest styling trends for festival season. Collusion Unisex Tie Dye Trousers (£25.99) are a great option for a bright pop of colour while still being comfortable. Try them with the matching Collusion Unisex Tie Dye Blazer (£49.99) or opt instead for a white T-shirt or hoodie.