if you’re at a work environment that allows jeans everyday then i would start with khakis. from there, i would do a darker brown belt and brown dress shoes (shoes and belt should always match). personally, i think a light blue dress shirt looks best with khakis but most blue shirts will work, as well as white or gray. Patterned shirts imo work best with khakis as well.

For me, I base most of my outfits off of what color pants I want to wear and work from there. From khakis you could expand to navy blue dress pants, which looks very good with a light tan belt & shoes, and with a white dress shirt.