The shortest possible answer
A collared polo or sleeveless mock, a skort or shorts with proper inner shorts, a single glove on your non-dominant hand, golf-specific shoes (spikeless is fine), and a hat or visor. That is it. Anything extra is style; nothing extra is rule.
The polo
Most courses require a collar. Performance-knit polos in pima cotton, recycled poly, or merino-blend all work; pick the fabric that breathes in the temperature you usually play. A sleeveless mock-neck satisfies the collar rule and is cooler on hot days.
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The bottom half
Skort, skirt, or tailored trouser — your call. Skorts are the easiest because they have built-in shorts and grip-strip waistbands so nothing rides up on the swing. Look for a length you would wear to a club lunch (most courses prefer this).
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The glove (yes, just one)
One glove on your non-dominant hand (left glove for right-handed players). Cabretta leather is the soft-feel premium; synthetic gloves last longer. Either is fine; pick on grip feel.
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The shoes
Soft-spike or spikeless. Spikeless looks tidier off-course (range → restaurant) and is more comfortable on flat ground; soft-spike grips better on wet slopes. For your first set, spikeless is the easier choice.
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Layers + accessories you probably need
A merino quarter-zip or a wind shell for the cold morning tee-times; a visor or cap for sun; sunscreen; a small tote for the snacks and the water and the spare ball. The wind shell is more important than people realise once you have actually played a windy par-four.
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What you really don’t need (yet)
A full bag of clubs (most courses rent), a rangefinder (look at the yardage markers), an outfit per round (two rotating polos is plenty), or any branded apparel. Comfort and the dress code is the bar; style develops with time.