CFS has a tendency to be freezing! I'd bring some layers. Other than the Archie League banquet no one is super concerned with how you're dressed. A lot of people wear Natca gear otherwise just don't look like a bum. You could be interacting with industry, FAA, and Natca professionals and higher ups.
All they said last year (also told business casual) was no PAC gear. Other wise I saw shorts, jeans, NATCA shirts etc. Archie leagues though, come to impress.
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