Business Dress Code for Man - Office Visits and Factory Visits (Thermal Power Stations)

I am arriving in Shanghai in Mid March and am concerned about the weather (temperature range) and also proper clothes.
1) Business Dress - in and around hotel
2) Business Dress - at customer host business office
3) At factory or plants (coal fired power thermal electric plants - often dirty/dusty environments).
4) Business dinner or Business lunches
5) Personal travel (1 Day) in Shanghai - by myself.