Related Clues:

• Not dressed
• Nude
• "The Thinker," for one
• How to skinny-dip
• Art-class model, often
• Like undecorated walls
• Art-class subject
• Posing subject
• Staircase descender?
• Wearing no clothes
• Like some essentials
• Balls-out, say
• With nothing on
• Like some yoga classes
• As one entered the world