Monochromatic does not have to mean monotone… This season are all the pieces in one colour very trendy.
Basic rule is that all or almost all pieces are in the same colour – nuances can be different.
You can also choose to introduce a second colour – neutrals like black, white or beige or to focus on one detail in some very vivid colour and make it pop!

Here are some fall/winter runway/street style inspirations for you: