Choose a blue, then see where it takes the outfit. Maje's women's Blue Selection makes a colour the starting point, with room for either a single accent or a more closely related palette. A blue piece alongside jeans can build continuity without requiring an exact match. Compare the tones together rather than assuming they will look the same in isolation.
A bag in a colour you already wear can keep the rest of the combination grounded. When the edit has no listed options, take the idea into your own wardrobe and use the broader categories to look for a suitable addition.