Here's the result. I don't know if I didn't use enough dye, but the t-shirt came out lighter than I had hoped. However, I love how the cardigan turned out.
Fresh off my green sweater success, I turned to another couple of items whose design I like but color I don't. Pale, peachy pink and bright tangerine are both great, but not with my skin.
(It's missing the middle button. I'm working on that.) These last two photos were taken by a child standing on a wobbly chair. But at least we avoided my selfie face.
If you are thinking of playing with Rit dye, I recommend starting with something that's not precious to you, preferably purchased for two dollars at your favorite thrift shop. My limited experience says that the best results come from starting with a light colored fabric and adding a dye in a related but darker color.