The phrase "right one alley" can often be replaced with synonyms such as "up your alley," "in your line of work," or "suited to your tastes." These phrases all convey the idea of something being perfect or ideal for a particular person or situation. Other synonyms include "right up your street," "tailor-made," or "custom-fit." These expressions are often used to describe finding the perfect match, whether it be in a romantic partner, job opportunity, or a hobby. Regardless of the phrasing, they all suggest that the person or thing is an excellent fit and well-suited to someone's preferences or abilities.