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That's what I thought, but Wiki says...

Billie Thomas first appeared in the 1934 Our Gang shorts For Pete's Sake!, The First Round-Up, and Washee Ironee as a background player. The "Buckwheat" character was a female at this time, portrayed by Our Gang kid Matthew "Stymie" Beard's younger sister Carlena in For Pete's Sake!, and by Willie Mae Walton in three other shorts.

Thomas began appearing as "Buckwheat" with 1935's Mama's Little Pirate. Despite Thomas being a male, the Buckwheat character remained a female—dressed as a Topsy-esque image of the African-American "pickaninny" stereotype with bowed pigtails, a large hand-me-down sweater and oversized boots. After Stymie's departure from the series later in 1935, the Buckwheat character slowly morphed into a boy, first referred to definitively as a "he" in 1936's The Pinch Singer. This is similar to the initial handling of another African-American Our Gang member, Allen "Farina" Hoskins, who worked in the series during the silent and early sound eras.

Despite the change in the Buckwheat character's gender, Billie Thomas's androgynous costuming was not changed until his appearance as a runaway slave in the 1936 Our Gang feature film General Spanky. This new costuming—overalls, striped shirt, oversized shoes, and a large unkempt Afro—was retained for the series proper from late 1936's Pay as You Exit on.