The tailor’s shop is traditionally read as shaping yourself to fit a role, or a role being shaped to fit you. Being measured can stand for feeling assessed; alterations for adjustments you are making in life.
Has this come up in your dreams before? What was going on in your life then?
My Cosmic Code has a private dream journal. Write a dream down and the app picks out the symbols in it, shows what dream books say about them and, over time, which words recur across your entries. The journal is stored on your device only.