What does it mean to say your my cheap suit?

Saying "you're my cheap suit" typically implies a sense of familiarity and comfort, suggesting that the person is reliable or dependable, much like a well-worn, affordable garment. It can also convey a hint of affection or humor, indicating that while they may not be extravagant or perfect, they hold value in a personal or emotional context. This phrase may reflect a playful or endearing sentiment about the person's presence in one’s life.