White boots earn their place beneath a floral knit skirt by making the outfit look less interrupted. The trick is proximity. When the boot shaft nearly meets an ivory hem, the pale surfaces form a longer visual line, while a matching cardigan connects that line to the rest of the outfit.
Contrast, not whiteness alone, determines how smoothly that line reads. Ivory and white differ, but their similar light values keep the change between knit and leather relatively quiet; a dark boot, by contrast, draws a firmer boundary at the ankle or calf. Floral motifs add another layer of visual weight. If their colors are strong, the boots give the eye a calm place to land rather than competing with the print. Texture matters too: a soft knit beside polished leather can feel deliberate even when the colors are close.
A strip of exposed skin changes the proposition. Between the hem and boot, it introduces another tone and a horizontal break, making the silhouette feel more casual and less continuous. The effect depends on the width of the gap and the contrast between skin, skirt and boot; a narrow opening can read as a small pause, while a wider one becomes part of the design. Neither choice is inherently better. Pull the boots closer for a quieter line, or leave room for a little tension. Between hem and leather, even an inch can become a decision.