In case anyone doesn’t get the reference, Peter Davison, the fifth classic Doctor wore a stalk of celery pinned to his lapel.

I mean, technically the celery had some practical uses. It helped to revive Peri after she came down with spectrox toxaemia, and its main purpose was to detect praxis gases (to which the Doctor was allergic, and with cause the celery to turn purple).

My two favorite companions in the modern era!

And yet the Sixth Doctor was never committed in spite of his fashion choices.