[Flutter] How to add decoration (border, hintText, prefix icon, suffix icon) to new...

1. 
   How would you add decorations like border, hintText, prefix icon, suffix icon to new Autocomplete Widget along with validation to check if it is empty...?
   
   I referred to Flutter Autocomplete class documentation, it was not very helpful....
   
   
2. 
   Also if possible, want to have multi select option with chip similar to what's shown here in the screenshot
   

Any suggestions?

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