US: 20-22 to United Kingdom Size 8-10
Cross-market women’s sleepwear conversion mapping 20-22 specifications into 8-10 for nightgowns, pajama sets, and sleep shirts.

Analyzing Women’s Sleepwear Equivalence Across Markets
US: 20-22: Corresponds to a relaxed bust range of 113–117 (44.5–46.1 ), elastic waist range of 95–100 (37.4–39.4 ), and comfort drape classification Loose Lounge Fit.
United Kingdom Size 8-10: Corresponds to a relaxed bust range of 84–88 (33.1–34.6 ), elastic waist range of 66–70 (26–27.6 ), and comfort drape classification Relaxed / Comfort Drape.