My son was 3 1/2 when I bought him for him with a head size in the 50th percentile. It fit him perfectly and would also suit the slightly larger head size.
Reversible Boys' Accessories: NIce Caps Breathable Protection Hats & Caps
50 Review
Connectyle Toddler Bucket Protection Green Boys' Accessories for Hats & Caps
53 Review
Connectyle Kids Wide Protection Bucket Boys' Accessories
54 Review
Versatile Foldable Sun Hat with Adjustable Drawstring - Boys' Essential Hat & Cap Accessory
46 Review
Mujjo Knitted Winter Gloves with Touch-Screen Compatibility, Dual Insulation Layers, Full-Hand Mobility, Non-Slip Phone Grip and Leather Wrist Cuff".
64 Review
𧣠Warm Winter Chenille Cashmere Stretchy Boys' Accessories by Motarto
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ORVINNER Kids Winter Gloves - 3 Pairs Children Warm Wool Lined Gloves for Boys and Girls, Toddler Thermal Knitted Mittens
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βοΈ Coobey Pairs Gloves: Winter Stretchy Boys' Accessories for Optimal Cold Weather Comfort
44 Review