long robes
裴 centers on long, flowing robes or garments, often suggesting a formal or elegant style of dress.
裴 combines 非 (not, oppose) with 衣 (clothing). The exact historical origin is uncertain, but it likely relates to a type of long garment, possibly with 非 contributing a phonetic element.
The top 非 looks like two opposing wings or flaps, and the bottom 衣 is clothing. Imagine a long robe with wide, flowing sleeves that spread out like wings.
For ハイ, picture a person wearing a long robe and waving high: high -> ハイ, as the robe flows in the wind.