Augusta SportswearSleeve Stripe Jersey, 3X-Large, Black/White

Is the Royal Blue the color shown or is it darker?

Seller: can they be silkscreened? White on a colored shirt?

What kind of material are the stripes made from? Fabric, or vinyl?

Since it's a man's style shirt, should a woman order her usual size or a size down? I wear a medium t-shirt, but don't want this to swallow me.