In Easter week, liturgically every day is another celebration of Easter. That's why the preface reads "on this Easter day" even though it's not Sunday.
In the ancient Church, the newly baptized (called the neophytes) wore their baptismal robes to the liturgy throughout this week, wearing them for the last time on Saturday.
Even though they took off their robes, they had put on Christ. We have too. Like them, we still live in the presence of Jesus every day, walking with him along the road of the Christian life.