From experience of over 60 years living in a hot and sometimes humid environment the best clothes to wear should be made from cotton fabric.

thanks to Mr Abdalla .

But I want more details

Welcome,

I carry out tests of different fabrics (natural and synthetic) according to standards (water vapour permeability, water absorption, air permeability or other) and in dynamic condition - using cyclo ergometer and human object. According to my experiences, I can say, that:

-   cotton fabrics are good, but they are too wet too long (because of, intense human sweat process and slow drying process) ,

-  if you would like to use blends,  in my opinion, try polypropylene for inner layer (near skin) and cotton/viscose for  an outer layer. I think about 2-layers knitted fabric.

- polypropylene yarn should be chosen carefully, check surface properties (hydrofil-hydrofob features ) Most of the  yarns are hydrophobic and human sweat  - sometimes in liquid form,  can not be able to migrate to  an outer layer.

- coolmax could be good choice, but  is not the best solution,

- the micro fibre yarn (mulitfilaments) could be considered,

- think about natural silk fabrics, hemp/flax fabrics - good   moisture absorption and water vapour permeability.  Additionally, flax/hemp fabrics characterise  by high UV- protection level (important in hot sunny conditions). 

And the last thing, but important. The sweat absorption (by textiles)  process is harmless  as long as a human organism cooling process  (realised by skin and sweating process) operates properly. If you  take off sweat from skin surface too fast , an organism can not be able to cool and the risk of heat/thermal shock occurs.

This is a common problem the answer to which is very complex:

• the type of fibre has some effect but febric structure and finishes dominate absorption and permeability to vapour and air

• in terms of fabric structures the key parameters are thickness and cover.

There is debate about whether it is desirable or not to remove sweat from the skin surface - vaporisation at the skin surface has the most effect in cooling, but a damp skin tends not to be very comfortable to a wearer.

thanks to dear Dr Izabela Jasinska for perfect answer. You are the best .

my project is study and evaluate about best fiber . unfortunately I had no laboratory to test and compare different fabric that you said.

can you tell me about good resources?

thanks for good point Dr Raechel M Laing . 

i think cotton and cotton blend is best option.