For vegetarian food, you may look into Vegetarian Diet in Shanghai(https://www.travelchinaguide.com/cityguides/shanghai/dining/vegetarian.htm) for some info.

What do you mean by Clothings, do you mean where to buy or what to bring? T-shirt and a thin coat is OK for early October if it's about what to bring.
FYI: Shanghai Shopping(https://www.travelchinaguide.com/cityguides/shanghai/shopping.htm)