where do i get information about name of clothes which is worn in different degree of temprature like during +20, +10,-0,-10 and -20
Tricky question! I would personally look for the answer in different hiking guides. You might want to browse through a few books before finding the right one. Why not start with "The ultimate hiker's gear guide", which can be found in the Helmet libraries:
If you want to search the Helmet database yourself, you can use the search term "erätaidot" as a starting point.
This is also a subject found on various hiking pages online. Try googling terms like "hiking" and "different temperatures". This page lists a few suggestions for several weather conditions: