Hat of the Nimbus Mage (Patreon)

Wondrous item, rare (requires attunement by a druid, sorcerer, warlock, or wizard)

This twin-peaked wizard hat has thin, wispy clouds circling its mountainous spires. You can mentally command the clouds to look like different weather using an action.

The hat has 7 charges and regains 1d6 + 1 expended charges daily at dawn. If you spend at least 1 hour in a naturally occurring fog bank, the hat regains all expended charges at the next dawn instead.

Spells. While wearing the hat, you can expend 1 or more of its charges to cast the following spells from it, using the typical casting time for each spell when you do: feather fall (1 charge), gaseous form (3 charges), or misty step (2 charges; you appear as a swiftly traveling patch of fog). Alternatively, you can use an action to expend 1 or more charges from the hat to cast the fog cloud spell from it. For 1 charge, you cast the 1st-level version of the spell; you can increase the spell slot level by one for each additional charge you expend.

Neutralize Weather. While wearing the hat, you can use an action to expend 2 of its charges to return any naturally occurring inclement weather within a 1-mile radius, centered on you, to a neutral state. The neutral weather can be clear or with light clouds, cool or warm, and with either a calm or moderate wind. After 8 hours, the weather returns to its previous state, unless the GM rules otherwise. You must be outside to use this property of the hat.

This is peak all-weather headwear.