In a popular online role playing game, players can create detailed designs for their character's "costumes," or appearance. Alonso sets up a website where players can buy and sell these costumes online. Information about the number of people who visited the website and the number of costumes purchased in a single day is listed below.

349 visitors purchased no costume.
71 visitors purchased exactly one costume.
12 visitors purchased more than one costume.

To find the total number of costumes purchased, we can add up the number of costumes purchased by each group of visitors:

71 visitors purchased 1 costume each
12 visitors purchased more than 1 costume each

So, the total number of costumes purchased is:
71 + 12 = 83 costumes

Therefore, on that single day, a total of 83 costumes were purchased on Alonso's website.