Assuming you're not showing up in something undeniably "dressy," like a dark-colored suit with a white shirt with French cuffs, being "casual" is more about you

Assuming you're not showing up in something undeniably "dressy," like a dark-colored suit with a white shirt with French cuffs, being "casual" is more about your attitude with your clothes, how you wear them, than the clothes themselves. Assuming you're wearing the same clothes in both situations, does it look like you're ready for a wedding or that you found the first few clothes in your closet with your eyes half closed and somewhat magically the color and fabric combination is eye-catching?