Difference Between Business Casual & Semi Formal Formal And Casual Dress Difference How can you tell if a dress shirt is formal or casual? The easiest way is to look at the collar, the placket and the edge stitching. Tiny details but they communicate a different vibe. Spread collars Simple Elegant Lady Formal Stretchy Dress Women Clothes Black Casual O Neck Sleeveless Skinny Folds Slit Robe Party Vestidos Difference Between Casual And Formal Clothes How to Wear a Black Dress in Summer Charmed by Camille