The Big Easy (1996) : 1x12

On the night of Marti Gras, Remy finds himself held hostage at his hangout, the Blue Spot Bar, by an escaped convict, named Lyle Tillman (Silas Weir Mitchell), who seeks to prove his innocence of a murder-robbery the previous year while Lyle's very pregnant wife, Grace, holds C.D. hostage in his office at the police station as another bargaining chip leading to Darlene (stuck wearing a Little Bo Peep costume) as well as Anne (stuck in a Marie Antoinette costume) to try to help defuse the situation while Smiley finds himself the errand boy between the two standoffs while Hawkins assembles a group of SWAT men (stuck in clown costumes) to plan a brash assault on the bar in spite of the situation.