I have tried a Tom Ford suit on in Harrods, and I know my size etc perfectly.
I also own/have tried/sold as a sales associate suits from: suitsupply, hugo boss, canali, corneliani, tagliatore, pal zileri, zegna, kiton - so I know exactly where I get the most quality for my bucks, dont worry. I am interested in buying a TF suit, because I am a huge fan of him and I also own multiple Tom Ford items (from Tom Ford era and Gucci Era) - the TF suits have a strong signature look, and they are super appealing to me, because I wear suits when going out in the evening etc.
I would never buy a Tom Ford suit for work, and I would never recommend anyone investing in a Tom Ford suit, before a Canali suit for example.
I just know that many people on this forum and other style sites are talking about great prices on suits on ebay, and I wanted to ask which risks you take, even when you are covered by the ebay money back protection :)