Dress in is a phrase that refers to the act of putting on clothes or wearing attire. There are various synonyms that can be used to replace the phrase dress in, such as don, wear, outfit, clothe, and raiment. The word don is often used to convey a sense of formality or ceremony. Wear can refer to both casual and formal clothing, while outfit is often used to describe a specific set of garments worn for a particular occasion. Clothe carries a more general meaning and can be used to describe any kind of clothing. Finally, raiment is a more poetic synonym, often used in literature or religious texts.