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A couple of ways to dress up a long sleeve and color and layers!
Pick 2 colors. A neutral and a random! In this picture, it would be green and brown! You could do red or tan even light blue and black. First bottoms. Find a pair of bottoms that are colored of your preferred choice. The rest of your accessories should then be the neutral color. The pants should be very important because if they were normal than your color combo would just be white and brown. Adding the pop of color sort of makes the rest of the outfit look modern instead of professional. The neutral accessories should be the ones that bring the whole outfit together. If it was just your white log sleeve and colored bottoms, it would just look too plain and that you`re trying to add pop!
Image not mine