Seems clear that Stephenie Ann McPherson ran the 400M final with a Nike headband with swoosh visible (to go with the Puma uniform). In fact, looks like she purposes tiled her chin down to display her headband when introduced in the blocks (at least on the universal broadcast). I get USATF has sponsor protection rules in place so not trying to stir that up. Impressed that JAAAF allows that conflict with Puma.
IAAF rules only state the marking on headbands, watches, etc. be limited to manufacturer, one placement and a certain size.