It's all about timing. FD can't prevent target or destruction effects until after resolving. ECON targets before resolving, so FD can't stop it if they're in the same chain. However, chaining FD to cards like SRH can prevent their destruction effects since they don't activate until resolving.
How can a spell still target a card that isnt a proper target? If it cant be targeted, it doesnt matter if it was targeted prior, dress target cant be a target. The spell should fizzle because it would have no target.
Forbidden dress DOES NOT UNTARGET YOUR CARDS, if your monster gets targeted by e-con you see the animation of targeting right? After that it is already too late, chaining dress DOES NOT WORK beacuse your monster is targeted already.....IT DOES NOT UNTARGET YOUR MONSTER
If it’s chained it’s ineffective, if it’s after the fact it’s ineffective. Kinda makes it useless really