There are many ways to create contrast in your outfits. Between the clothing items, between the items and your footwear or accessories. Between all of those things and your skin tone. And you can create contrast within the patterns on items.
White jeans with black shoes for high contrast. White jeans with silver shoes for low contrast. White jeans and black shoes look vivid, graphic, and striking with a black top. White jeans and silver shoes look pretty, soft, and streamlined with a pastel top.
When an outfit looks off, try adjusting the contrast between its components. Consider the items, footwear, accessories and your own colouring. Use high contrast to draw attention to components, and low contrast to blend them in.