Mend a skirt

• Change from maxi to midi, say
• Alter, as a skirt edge
• Make new A-line lines
• Undo some shortening
• Shorten a dress again
• Adjust a skirt;s length
• Shorten, maybe
• Alter, as a dress
• Make some alterations

Wiktionary Word definitions in Wiktionary
vb. (context transitive English) To supply (a garment, etc.) with a new hem.