This is one way in which I like to wear pastels: sort of monochromatic way. I don't try to match them, but I certainly look to find colors that are on the same chromatic level. As you can see this dusty blue from the coat with the dusty green from the pants are very close as tone and to complete the look without adding another pastel color I chose grey to unify them. Instead of adding a bold accessory I added a bold color with my shoes to complete the look.
It is all about the color scheme!
Coat: H&M/ option Here, Here and Here
Bag: Costume National
Pants: Mango/similar Here and Here
Shoes: Shoemint/ I also love this pair Here
Ring: c/o Tres Jewellery/ Here
Sunglasses: Ralph Lauren/ option Here