Here is Butterick Pattern # 6597 UNCUT Tailored Blouse with Variations by JG Hook in sizes 18. 20 and 22. Very loose-fitting shirt has convertible collar, button/loop at neck, dropped shoulders, yokes with forward shoulder seams, back pleat, shaped hemline and long sleeves with pleats and button cuffs.
The pattern and instructions are still factory folded the envelope shows some wear and creases from storage.