Does anyone know if there is

[FelicityFlops]

a site or search engine where you can find last year's fashion (and buy it)? I dithered over a Weekend Max Mara dress. It sold out pretty quickly, but I would happily pay a premium (within reason) to buy one.
Thanks

Brand alley or secret sales

For new, The Outnet. For second hand Vestiaire.

Do you remember what it looked like? I often find Google helpful - example 'white Max mara dress with purple stripes cotton midi length'

Or Yoox

Ah, I had forgotten about Brand Alley and Yoox.
I know what it is and the style name, but the only place that I found when searching was also sold out.
This was my search.
WEEKEND MAX MARA
Sir green tropical print silk dress
That will teach me to be so indecisive, but will have a look at your suggestions above, so many thanks.