This suit was developed by MIT Media Lab and how it works is that as the plot develops, the book produces physical sensations to mimic the characters’ emotions, for example:
If the protagonist is scared, bags in the vest constrict to make the reader’s chest tight.
For excitement, the vest can vibrate to influence the reader’s heart rate.
If a character is embarrassed, a heating device changes skin temperature.
They have currently just tested it for one book at the moment, but companies like Disney are working on their own wearable books too.