Option 1: For a speedy tally of T-Shirt sizes, go to Home > Dashboard. If you haven't already, customize your dashboard by clicking the link on that page.
Then, select which events and/or applications you'd like to view on your dashboard. Drag and drop the "shirt sizes" report to your preferred event. Changes save automatically. Return to your dashboard to view the report.
The second option option is through the Export tool, under Volunteers > Export.
Select "T-Shirt Size" under Custom Fields on the right-hand side, and use the “Group by volunteer to get hours reporting” checkbox to give you an un-duplicated list of your volunteers. You can then sort and tally t-shirt sizes using this spreadsheet.