Mixing prints is best avoided, even major stylists struggle with creating the perfect combination of color and pattern.
However, there are some easy combinations you can try such as stripes and florals. I look the yellow tones from the skirt to pair it with a golden striped boatneck tee. My army jacket serves a great neutral piece that ties the look together.
Jacket: J.Crew (Similar)
Top: Zara (Similar)
Skirt: Forever 21 (Similar)
Boots: Piperlime (Similar)
The key to mixing prints is to keep one color in common. Also, cool and warm tones complement each other (i.e white and navy) and grays, beiges, khaki and white all work great for shoes, jackets or bags.