Managed to get a stain (red wine/port??) on the lapel face (lighter grey). Haven’t tried anything too harsh as I reckon cloth looks like it will discolour quite easily. Dry cleaner was scared to blitz it and my local alterations/seamstress reckons I’m stuck 
2 questions. Suggestions to shift mark? If I damage during attack can I buy the silk(?) so my local alterations place could replace.
Dunno about removing the stain, but you can definitely get No.5s re-silked. It’s a fairly common repair/renovation that tailors perform.