Things to Take
Bare necessities:
Trekking shoes: You will need trekking shoes with good grip. Sports shoes will not be comfortable enough.
Backpack (40-60 litres): A backpack with sturdy straps and a supporting frame. Rain cover for backpack is essential.
Clothes
Three warm layers: On the pass crossing day, you will need at least three warm layers (two lights layers such as fleece and woolen and one padded jacket) for this trek.
Two trek pants: Wear one pair and carry one pair.
Two collared t-shirts: Carry light, full sleeved t-shirts that prevent sun burns on the neck and arms. Again, wear one and carry one.
Thermals (Optional): Those who are more susceptible to cold can carry thermals to wear at night.
Accessories
Sunglasses: Sunglasses are to prevent snow blindness. These are more important in June. There might be snow at the upper campsites regardless of the season. So carry a pair of sunglasses.
Suncap: The sun is intense at higher altitudes and a sun cap is absolutely essential to keep your face and neck safe from sun burns.
Synthetic hand gloves: One pair of fleece or woolen hand gloves. One pair of water proof gloves.
Balaclava: You may use woolen scarves instead as well.
Socks (2 pairs): Apart from two sports socks, you can take a pair of woolen socks for the night.
Headlamp/LED torch: Mandatory
Trekking pole: Watch this video to understand why you need a trekking pole.