When I was in the military, the uniform of the day specified what I wore on a given day. I usually wore drab olive fatigues and combat boots, but on occasion I was required to wear my dress blues and spit-shined shoes.
When Paul wrote his letter to the Colossians, he described their uniform of the day, and he instructed them to:
Dress in the wardrobe God picked out for you: compassion, kindness, humility, quiet strength, discipline. Be even-tempered, content with second place, quick to forgive an offense. Forgive as quickly and completely as the Master forgave you. And regardless of what else you put on, wear love. It’s your basic, all-purpose garment. Never be without it. ~Colossians 3:12-14: The Message
Regardless of whether you’re wearing blue jeans, a black tie and suit, or a stylish dress, don’t forget to put on the love of Christ—it’s your “all-purpose garment” and uniform of the day.