😅 has anyone tried this before

That sounds like such a fun idea! I haven't tried anything similar myself for years, but I'd make sure you do a bit of a test run, as some fabrics will respond better to bleach and dye than others.

Another thing to look out for is stitching - often the stitching will be nylon and not dye in the same way that the rest of the fabric does. Try to stick to more natural fabrics as they'll dye much more easily.

Let me know how it goes if you go for it!

I haven't, but I'm hoping to dye my wedding dress so I can wear it again as a 'posh frock'!

Natural fibres will dye better than artificial, and as Jamie says, watch out for the stitching. It might be worth trying on one to see how it works out, if they're not too expensive.