Outfit choices are remembered across chapters. If you have an outfit choice in episode 1, that character will wear that outfit until you use another outfit choice to change their outfit later in the story.
Text choices are not remembered across episodes. You cannot set up a situation in a later episode that requires that a reader selected a certain choice in a previous episode, for instance.
But heart points are remembered. Using heart points, you can keep track of a reader’s preferences for a particular love interest, and this can be used towards unlocking endings. These points are accumulated over the course of the book. Note that you can also assign heart points (also known as charm points) to the MC. By doing this, some heart points will also be applied to all LI.