Orphilia
I have not been in this tour, but I have been in 8 JY tour ith my 9th leaving next week, and YES I have travelled all around the world.
Unless you are visiting some where posh on the tour then I would say smart casual is the way to go, and comfy shoes along the way as well. Clothes that you can layer on and off work for me.
Check with hotel websites to see whats on offer re, hair dryers and irons, tea/coffee facility's to save packing everything. Most hotels nowadays have toiletries as well which saves on the weight allowance.
Have fun on the tour
Cindy