I called it a wrinkle suit because I have seen the term somewhere recently and it seemed to describe it. It is really a jogging suit in style but somewhat dressier than the ones actually meant for jogging. The fabric has a wrinkled look naturally. Not full of wrinkles, just not smooth like something that has been ironed would be - sort of crinkled. I know it is too casual for normal dining room attire, but since the first night is more casual, I thought it might be O.K. then. They are really comfortable for traveling - loose enough to allow for easy movement, not too warm and not too cool, pockets.
You didn't say which cruise ship you'll be on. If you are traveling on an "upscale" cruise line, you may want to check your brochure.If it is Carnival, Royal Caribbean or Princess, I think your wrinkle suit will be fine for the first evening's dinner. Most of us wore what we had worn on the airplane anyway. (In my case, usually, khaki pants and a feminine-type scoop-neck top but not athletic shoes.) By the first evening's dinner some people haven't gotten their luggage delivered to their room yet, so casual is expected.
The waiters and the cruisers you are sitting with will just be happy that you showed up the first night and will not look at what you are wearing. Trust me. the last cruise, we were so looking forward to meeting our table mates that if they showed up in pajama's we would could have cared less