Does anybody on here know how to obtain a computer aided design (CAD) system for computers? Can they also be installed on iPads and smart phones?
I need this system for various reasons (among them for the eventual purchase of 2 bespoke shirts and a bespoke suit). This technology is actually used by many for purchases of bespoke clothing and shoes.
There is an ambiguity in your post as you did not specify which CAD systems you want to use. If you are looking for clothing/pattern cutting, there are specific tools (AccuMark or Grafis) that are used by clothing professionals to cut pattern. OTOH, if you are looking for something that can cut-n-paste on existing photos, any free graphic tools can be used for that purpose. There is no need for Photoshop.
If you are looking for 3D modeling, there are also some free tools available to use. However, those tools are not geared towards to clothing, and it is even harder to model a human body (do you know how many triangles to model a face?).
There is, however, some fashion tools that may be available at AppStores. Check the girl/women's fashion apps and they might provide some tool that can give you some ideas. That could be a fun experience.