Your Sunday best
Definition 1 of 1
Pro Tip 1/3Special Occasions
Wear your Sunday best for events like weddings, religious ceremonies, or formal parties. 
She had her Sunday best on for her graduation ceremony.
Pro Tip 2/3Outdated Use
The term is traditional and isn't as commonly used among younger generations. 
Grandma always refers to formal attire as our Sunday best.
Pro Tip 3/3Cultural Nuance
'Your Sunday best' originates from the custom of wearing your finest clothes to Sunday church services. 
Back in the day, everyone would be in their Sunday best for morning mass.