There used to be two rules about colour at a wedding - don't wear white (obvs!) and don't wear black. But 'they' never said anything about monochrome, now did they? Unless you haven't been in a shop since September, it won't have escaped your notice that monochrome - that classic pairing of black and white - is the look of the season (well two seasons actually). So if you're on the hunt for something fabulous for an upcoming celebration, it's safe to say you'll be bagging yourselves a black and white wedding guest outfit of some kind. Here's where we come in! We've done the rounds of all our favourite siopas and found a bevy of monochrome beauties of all shapes, sizes, and prices for your delectation...

And whether the wedding is black tie formal, city chic or summer fete style, there's a monochrome outfit option out there for every occasion  - we've seen short, long, strapless, sleeveless and pixie shifts.

• Drop waist checker dress by Tibi from Shopbop €355.22
• Monochrome peter pan collar dress from Ted Baker £129/ €149.06
• Monochrome sheer top and textured skirt gown from Mango €159.99
• Scattered dot shift dress from J. Crew €170.91

Everywhere you look, in every single boutique, monochrome really has taken over the rails, so no matter whether you're a classic lady or more of a statement girl, there's a  look to suit your tastes -  colour blocking, prints, stripes, lace and polka dots all feature.

• Monochrome zigzag crochet-knit gown by Missoni from Net-A-Porter €1,560
• Sleeveless peplum combi dress from Mango €69.99
• Colour-blocked crepe pencil dress by Osman Yousefzada at Browns £740
• Karita puff sleeve dress from Reiss  €205

Plain black and white can feel a little austere to those of us who love a bit of sunshine in their wardrobes, so brighten up the monochrome with some loud accessories - neon is everywhere, and goes amazingly well with monochrome, but equally a pair of red shoes or a statement necklace will take the edge off.

• Monochrome shift dress from Zara  €39.95
• Floral print monochrome dress Karen Millen €199.00
• Monochrome stripe dress with Back detail from Warehouse €78.00
• Colourblocked pencil dress with mini peplum by Karen Millen €240.00

The one thing to keep in mind when choosing a monochrome look is the old rule about wearing white at a wedding - be careful not to stray inadvertently into danger territory, especially with colour blocking - don't emphasise the white. Break it up with colour or add more black in the form of accessories.

• Black lace embroidery dress from Karen Millen €215.00
• Sumie sequin chevron fitted dress by Alice and Oliva $550.00/€423.17
• Printed silk-crepe dress by Giulietta from Net-A-Porter €1,137
• Two tone lace edge gown by Mango  €99.99