Measurements, taken while laid flat: Pit-to-Pit: ~24in Length: ~24in Bottom opening: ~26in Please note! This item comes from a home with a cat. The cat has not worn the item (not her style) and this item is clean, but please keep this in mind in case you have a severe allergy! Very minimal pilling in armpits (pictured) from wear. I generally ship within 24 hours of purchase 🥰