3 technical T-shirts (one must be dry at all times)
2 light/midweight merino long sleeve shirts
Fleece jacket (not windproof, the fluffier the better)
Soft-shell hiking jacket (bit luxury, can do without)
Superlight wind shirt (ditto)
Backlit waterproof shell jacket
Light down jacket for evenings
It is not necessary to have many different weights of shirts for different conditions, just wear several at the same time if cold. It is possible to make do with less shirts than listed if you launder them more often, have to carry everything yourself or just be content to wear dirty clothes and smell a bit.
3-4 pairs boxer style underwear
Pair of lightweight merino long johns, 3/4 length
Light Capri hiking pants
Regular fairly lightweight hiking pants
Same thing here: if morning climb to Kala Pattar or Gokyo Ri , Larkyla , Throng la and Others pass feels cold, just wear both caprice and hiking pants both. Yo are likely to strip the top ones off after a while.
2 pairs wool-mix hiking socks
3 pair’s liner socks
Trail runners, low or mid-high.
Using liner socks prevents blisters and keeps the main socks cleaner and drier. I would take mid-top trail, unless doing the hike in mid-winter, when real boots might be nicer. Personal choice, but people tend to “overboot” on this trek also.
Wide brimmed hat
Light fleece gloves
Wool mittens (local)
Down sleeping bag, around -17C/0F rating
Nalgene bottle 1 liter
Daypack 24-32 liters
Duffel bag 90 liters (individual, for porter to carry) or 120-150 liters (for 2 trekkers)