shadow cloth and spell clothFollow

if you switch professions, yes you will lose the ability to wear the shadoweave set. So what i've done, is just keep my spellcloth cd's always up (yes making only 1 every 4 days) and then either spamming trade channels to buy people's spellcloth cd, or just hit the AH and pick up what you need there

Are you talking about Spellstrike or Spellfire?

Spellfire can only be worn by spellfire tailors, and you will lose the ability to wear FSW if you switch your specialty.

Spellstrike on the other hand can be worn by anyone, even non-tailors.