Patchwork quilts have lots of them

• Stitched lines
• Bottom lines?
• Clothing splitting points
• Clothing lines
• Lines of juncture
• Falling apart at the ___
• Furrows
• Hosiery features
• Joins with stitches

Wiktionary Word definitions in Wiktionary
n. (plural of seam English) vb. (en-third-person singular of: seam )