Check the fabric and key specifications
Prioritize styles with a dimensional change rate after washing close to 0%. High-quality synthetic fibers and blends can keep this within ±1%, far outperforming standard pure cotton, which typically shrinks by 3%–5%. For pure cotton options, choose high-count combed cotton, mercerized cotton, or liquid ammonia-treated cotton; these offer over 40% better shape retention than standard cotton. For daily wear, select fabrics weighing 180–220g with a yarn count of 18–50s to balance structural crispness with durability.
Check the neckline's shape-retention construction
Avoid single-layer plain knit or narrow rib collars; opt instead for double-layer ribbed collars about 2cm wide, reinforced with twin-needle or triple-needle stitching for superior resistance to stretching. Prioritize styles with back-neck taping to prevent the collar from stretching out when hung; this feature can keep the deformation rate below 5% even after ten washes.
Check compliance with testing standards
Prioritize products that meet the "First-Class Product" standard (GB/T 22849-2024), which requires a dimensional change rate of ≤±4% and a post-wash distortion rate of ≤4%-lower figures indicate better shape retention. Also, ensure the pilling resistance meets standards to avoid pilling or fabric degradation that could compromise the garment's fit and silhouette after washing.
