I wouldn't be against that to be honest. They could even deal with it in a similar manner to tech 3, apart from instead of creating a modular item after the construction process, the material choices create different patterns of item. If the materials were sourced using aurum, the platform is set for a sustainable cycle of development for popular items without wasting development hours outside of initial art assets (modules) and a modular interface (which i doubt they have for lcothing right now).
The main obstruction is additional development on fundamental code-items such as the modular build system (unless it were a simple 'colour variants' system). There may also be economic repercussions as people gain a controlling stake in Aurum flow (though not the sink or source) that I have not anticipated (the pool may be small and sculpt/multi-queue services are moving to aurum bought items instead of PLEX in the future - control of cash flow in that economy may have a significant impact on CCP and 'tailors'). An 'easy fix' (from our pov) would be to give us tailoring in ISK (via the mainstream economy), but this would directly compete with CCP interests even if source items were bought for aurum, as it would be final-purchase revenue that isn't translated into sunk 'premium' currency.
A capsuleer-run clothing economy would be interesting to see, but I am dubious as to its viability thanks to CCPs fixation on 'premium features' at present. No need to not propose solutions that might crack the problem - CCP are glacially slow and don't give credit, but they do seem to eventually act on input from the player base.