skirt
裳 centers on a lower-body garment: a skirt. It refers specifically to a skirt or a similar draped lower garment.
裳 combines 衣 (clothing) with a phonetic element that also suggests a lower garment. The upper part ⺌冖口 is likely a phonetic component, while 衣 indicates the meaning relates to clothing.
The bottom component 衣 means clothing, and the upper part resembles a draped shape. Picture a long piece of cloth wrapped around the lower body: 裳 is a skirt.
For ショウ, imagine a fashion show where models wear elegant skirts: show -> ショウ, and the skirt is the star of the show.