Q. Should I add a letter that got from school?
A. No. Attachments to you return prevent e-filing. They delay the processing of your return and the IRS basically ignores them in situations where attachments aren't normal (like claiming education credits). Save the proof for later, if and when you are "audited".
What is "smock"? Uniforms are only a qualified educational expense if classified as "course materials required for attendance".
