Most of the ones I picked up last at a thrift store were Brooks Brothers, with lovely fabrics and subdued patterns and colors. One of them I kept for myself, just added small shoulder pads and took a breast dart from under the boobs to the waist. I think it looks good, feels right and will last a long time.
Lots of people love men's shirts for the quality of fabric, much better than women's shirts. Costs a LOT less than buying just the material.