In "Shukutoku Shozoku-sho" and "Hoi Gunshoku Benmo-sho," he, as a researcher, demonstrated skepticism toward the premodern theories which had been commonly accepted, and this fact indicates that he was interested in studying historical evidence.
『宿徳装束抄』や『布衣群色便蒙抄』には生地について近世の通説を疑う研究的態度が見られるなど、考証的志向がある。