That's so sweet of you to throw a bridal shower for your sister.
She's going to be so thrilled when she see the shower you thrown for her.
The black and white damask print is very beautiful theme and it will go great with the green, black and white color scheme.
But throwing a bridal shower there are lots of things to consider as well; even though its a beautiful shower theme and color scheme.
Like for instance whats her favorite color? Maybe you can start with that or what she enjoys doing? etc.
In throwing a bridal shower try to go with the person, personality, it makes the party planning easier.
Here are some helpful links to give you more ideas (if need) to go along with your party planning. You may even find something that sparks an idea to go along with your shower theme.
I wish you all the best in planning your sister bridal shower!