What constellation are you?

This sentence means: "What sign are you in?" Ask each other's date of birth and constellation. "I tailor it for you" means that I am very suitable for each other, just like tailor-made clothes, very suitable for each other's body shape and needs. This sentence is to express an emotional fit and match, suggesting that they are very suitable or very suitable for each other, just like tailor-made clothes, very suitable for each other's body shape and needs. It is also to show your personality, characteristics or advantages to each other to attract their attention or goodwill.