US: 24 to United Kingdom Size 12-14
Cross-market women’s sleepwear conversion mapping 24 specifications into 12-14 for nightgowns, pajama sets, and sleep shirts.

Analyzing Women’s Sleepwear Equivalence Across Markets
US: 24: Corresponds to a relaxed bust range of 121–125 (47.6–49.2 ), elastic waist range of 103–108 (40.6–42.5 ), and comfort drape classification Loose Lounge Fit.
United Kingdom Size 12-14: Corresponds to a relaxed bust range of 90–94 (35.4–37 ), elastic waist range of 72–76 (28.3–29.9 ), and comfort drape classification Relaxed / Comfort Drape.