Add some cap sleeves or an overcoat for an extra wow-factor
On the 4th of July, its customary to wear the patriotic colors of the United States: red, white, and blue
Self tie touleau belt with metal tips
Otherwise, at least for me, the alternative is investing in a one-on-one class and learning some of these skills myself

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So, while it's a step down from black tie, it's definitely a step up from casual