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No one really cares about what you are wearing, unless you are staying in luxury hotels, and even so, only is really caring.
Depending when and exacttly where you going to, just make sure you can layer easly, and have always a set of confortable/warm clothes for the night(sleep) and after the tour.
Whool underwear and base layers will go a long away before they start smelling btw.
As far as gear:
on the flight, yes, carry all your gear with you. Make sure your bag is whithin allowed sizes. Even you lithium batteries have to be carried with you - not in checked luggage.
If you have a porter or most of your luggage is transported by anyone else other than you, saty with given limits, and pack your daypack according to region /scenary.
I would carry a UWA prime or zoom. 24mm is enough, but may come narrow in a few situations, and yes, the 100-400 is a good lens to have too.
As you have both cameras, and they have same battery type, I would set one with the 24-105, anthe other with a 16-35 or any other prime below 24.
Obviously you can always carry the UWA and 100-400 in you pack, but be very careful exchanging lenses( dusty area), and be aware of humidity levels too.
check TripAdvisor forums for clothing tips and such
ps: consider carrying a p&s too - not only is a backup, but can be used when you don't want to carry the big camera - i.e. going out for dinner, and if you have a private guide, hand him the P&S and tell him to shoot away everything he wants, in special you and your wife along the way.
leave the 100mm home
ipad- why not? beter yet a laptop, to view and store shots
11lbs is a given limit - if you really are way over that, they will make you pay for extra weigth.
wear your hiking boots, and dress in touring clothing - rain jacket or light sweater will fit in the bag ot around your waist
and last but not least - get gear insurance(thru your home insurance agent) and get travel insurance too, along with get all required vaccinations for the area (check with local CDC and your doctor/health provider)