i-adjective (yoi/ii class)
comfortable to wear
Rare adjective describing clothing that feels good on the body. Modern Japanese normally uses 着心地がいい or similar phrases.
このシャツはきよい。
This shirt is comfortable to wear.
Alternate rare kanji spelling.
着心地 is the common modern noun for how clothing feels; 着良い is a rare adjective with the same meaning.
Compound of 着 (ki, 'wearing') + 良い (yoi, 'good'). The exact historical derivation is uncertain, but it follows a productive pattern of noun + adjective compounds.