You'll be outside for several hours and you'll also be walking and standing a lot. Players and spectators can benefit from making sure they feel comfortable on the course.
Dress "formal casual"—a term that has grown to mean sporty clothes with a high-end look.
Even something like cargo shorts can be dressy. Make sure they are pleated and made of a high quality material, such as twill. Polo shirts are usually the standard for dressing your upper body. Choose solid colors or stripes with solid collars.
A cap is fine, but if you start adding golf-themed accessories, things can get tacky very easily. During a pro golf event, you want to project an image of professionalism—in other words, avoid looking like a fan.
Pro golf events typically last several hours, and being out in the open puts you at the mercy of the elements. Weather can be unpredictable, so be prepared. Just as wind has a big effect on how well players play the game, it also effects the way you experience the temperature.
Some pro golf events are sponsored by charities and have strict dress codes. Make sure to find out in advance whether there's a dress code - you'll save yourself a lot of embarrassment.
Look and take a clue from those around you. If you've attended golf events in the past, try to remember what others were wearing and who seemed out of place. This will be helpful to keep in mind when choosing your wardrobe.
Source: "How to Dress for a Pro Golf Event," Joe Rivera