I've bought a few - Canali, Crombie, Paul Smith, and never had a problem.
If the listing contains lots of photos includng of the label like this then you should be ok.
The ones to watch for are like this which could be anything.
In my experience the more information they list, the more likely that the suit will live up to expectations and that it will be in good condition.
'Trade' sellers are more likely to be selling stuff with slight defects so check the listing...