Woocommerce css

Hi there, great plugin, I’ve just got 2 questions

I run a woocommerce store and on each product page I have dropdowns of product attributes (eg main product is a tshirt and the attribute dropdown is colour for a customer to select black,blue and white) I want to use your plugin to hide BLACK tshirts for example in Germany. Each attribute doesn’t have a unique CLASS or ID but has a unique VALUE, is there a way to achieve what I want? I thought the below might work but it doesn’t

HIDE BLACK TSHIRT IN GERMANY:
.geoip-country-DE option[value=”black”]{
display:none !important;
}

thanks for your help