The term 'summer blouse' can be broken down into two crossword solutions: 'HALTER' (6 letters) and 'haltertop' (9 letters). A HALTER is a type of clothing that ties around the neck and leaves the back and shoulders bare. A haltertop is a type of blouse that has a HALTER-style neckline, usually with straps that tie around the neck. Both of these items are popular summer fashion choices due to their light and airy fabric and the ability to show off the shoulders and back.