Which of following item is most necessary to wear in hilly areas

Which of following item is most necessary to wear in hilly areas

پہاڑی علاقوں میں پہننے کے لیے درج ذیل میں سے کون سی چیز سب سے زیادہ ضروری ہے۔
Explanation

Jacket is a garment for the upper body usually having a front opening, collar, lapels, sleeves, and pockets