It's not hard. Heck, it's not even time consuming! Here is a basic example:
What have we done here? Well is was easy! Instead of assembling individual outfits, think instead of packing a collection – with pieces able to mix-and-match to perfection. Building a foundation of neutrals will allow for maximum mix-ability.
Then need to add your non-neutral color(s) into the mix. Keep in mind that any foundation colors you choose should have a 1 top and 1 bottom in that color, as well as another complimentary item.