I "survived" two pickpocket attempts in Italy this summer. First was in the Pitti Palace; a young man, blond and hip-looking, walked by very quickly (odd in an art gallery), bumping my shoulder slightly (odd because it was not crowded). I looked down and the zipper on the pocket on the leg of my cargo pants had been undone, though the map it contained was still there. I transferred the map to a safer location, after which I saw the same young man walking past me the other way, glaring at me as he passed. My guess is that he or a confederate would have made a second approach, to pick the pocket that had been unzipped, if I had not noticed it. Since he glared at me he must have known the pocket was empty (not that a map would be much of a prize), and if so, must have been texting with someone who told him not to bother.
The second time I was taking a photo of the Grand Canal in the scrum at the top of the Rialto Bridge; felt a tug from my right pocket, and looked down to see my little chained-to-the-belt day-money wallet (https://theluggageprofessionals.com.au/pacsafe-walletsafe-50-compact-wallet.html) hanging out of its pocket (valuables were in a money belt). The zipper was still zipped; in this case I think the would-be thief could not have known that I was using a chain, since I had my shirt untucked on purpose, just for such cases, so the chain was a surprise. I told him "nice try"; wish I had had the presence of mind to issue a general warning to the crowd. This young guy was also dressed like a hipster--cool blazer, white shirt, very neat appearance. Found out later I had an excellent photo of him, taken when I was getting a photo of the crowd; everyone else was looking at the canal, but he was focused on a lady's open bag.
If you don't mind looking a bit informal, I recommend walking around with an untucked shirt. This seems to add another layer of difficulty to the pickpocket's task. Also, in high risk areas, the little wallet and its short chain can be tucked under your waistband, so there is nothing in the pocket at all.
Finally, to respond to your actual question, the Clothing Arts clothes look great to me as a way to foil pickpockets, though I would always use a money belt too. The only reason I have not purchased any is their weight, which looks quite substantial, whereas I try to pack as light as possible.