The definition of Matchy-Matchy from Urban Dictionary is as follows:

Often used in fashion blogs. Used to describe an outfit that is too coordinated and consists of too many of the same types of colours, patterns, fabrics, accessories, designer pieces, thematic elements, etc. Can also be used in reference to interior design.

They don’t mention weddings specifically, but how many of us remember the eighties, when weddings were nothing BUT matchy-matchy? When the first thing brides did was select colors, and then proceed to order everything in those colors? We even remember a movie where the bride was asked by her reception venue what color to dye the mashed potatoes so that they’d match the bridesmaids’ dresses.  (Note- we are not linking to a page about said film because it was an artsy independent wedding movie so it broke the Big Studio Wedding Movie Happy Ending rule.  If you really want to see it anyway, google ‘Annabella Sciorra dyed potatoes’).
These days, people tend to choose a palette of colors they like that work well together, based around one favorite color. Basically that one is the one you’d have chosen if it were the eighties.  Then different elements of the wedding complement each other without all being the same exact color.

Check out The Perfect Palette: Palette Library for inspiration – or look at your own closet! A few colors you love will speak to you.  After all to look harmonious and pretty, the bridesmaids dresses don’t even have to match each other, let alone the mashed potatoes.

Bridesmaids and a packet of rice from America’s Matchy Matchiest Wedding of the 20th Century: Luci Baines Johnson. If she could have, she’d have painted the pillars of the white house pink!