How do you remove olive oil stains from clothes?
If the garment has not been laundered yet, try this: rub some talcum powder into the item and let sit for a couple of hours. The talcum will absorb the oil, or at least most of it. Then wash in warm water with detergent, but check to see if the stain came out before drying it. If the stain did not come out yet, apply some stain pre-treatment to it, and let sit for a day or so, then launder as usual.