The flag detail reads as a quiet signal, not a costume, and space black keeps the whole thing grounded enough for a desk. Cool and deep against the red and blue, no competition. Structured pique that recovers every time you stand up from a chair. The short week before the Fourth, half the floor already gone, and you still showed up looking like you meant it. Festive without trying, which is the only kind of festive that survives a business casual office.
Finish with dark leather loafers or matte black Chelsea boots.