Start with one pattern
Lay the patterned garment flat and find a colour already present in it. A plain top in a similar direction connects the areas without requiring an exact match. With a small pattern, the dominant colour from a distance may differ from the one you notice close to the fabric.
Look at the combination from two distances. Someone across a desk sees more detail; when you enter a room, the larger colour distribution comes first. Those views can be different. What matters is whether you intend that effect.
Connect two patterns deliberately
If you want to wear two patterns, change as few additional variables as possible. A finely striped shirt and broadly patterned trousers are easier to assess when their colours relate. With patterns of similar scale, a larger difference in the visible area can help, such as showing only a small collar rather than an entire open shirt.
Test the outfit with the jacket you will actually bring. It can hide much of the pattern or add another point of emphasis. A plain outer layer simplifies the transition between outside and indoors, but it is not compulsory.
Consider the work itself
Long scarves, hanging pendants and very wide sleeves may interfere with writing, drawing or working with equipment. Let your actual tasks determine which pieces need room and which are likely to get in the way. A coloured area can provide the same emphasis as several moving accessories.
If you are unsure in the morning, photograph two versions with the same trousers and shoes. Compare only the changed top. This makes it easier to identify the combination you prefer. Save a successful picture as a reminder without turning it into a fixed rule for every future colour choice.
Make a colour connection visible
Place three existing pieces on a large surface: green trousers, a shirt containing some green and a brown jacket, for instance. Look at trousers and shirt first, then add the jacket. If the connection disappears, the colour is not automatically wrong. The jacket may simply cover the patterned area that creates the link.
Wear it open and closed and compare the visible proportions. A small change to the opening may be enough. The same method works for a bag repeating a colour: assess it in its real carrying position rather than only beside clothes on the bed. Colour then becomes a visible arrangement rather than an abstract rule.
