It's my favorite semi-self-drafted long sleeve swing tee pattern. Previous versions here, here, here, and here.
The main black part was a sweater dress, and the gray at the neck, wrists, and hem is from an old pair of knit shorts.
Embroidery is not a skill I've had much practice in, so don't look too closely, but it's at least recognizable enough that this little lady knows it's a kitty cat.
Linking up to KCW here.