In Cockney rhyming slang what would you be wearing if put on your best whistle?

This is a bit of a tricky one! "Put on your best whistle" is a Cockney rhyming slang phrase for "clothes". However, there's no direct rhyming slang for "wearing".

So, you could say something like:

* "I'm putting on my best whistle (clothes) for the occasion."

* "I'm dressed (wearing) in my best whistle (clothes)."

It's important to remember that Cockney rhyming slang is often used playfully and humorously, so there's no single "correct" way to phrase it!