The garment measurements on a page should be specific to that particular item, not previous versions. They should be taken by measuring finished garments once they've arrived in the Toast warehouse. (Although I've been sent factory order sheets before now - this is bad).
If you measure similar items you already have, that you like the fit of, in a comparable fabric, that should be a good guide. But even measuring badly fitting current garments will help nudge in the right direction.
Constantly adjusting sizing without telling us is a nuisance, but should now at least be reflected in the garment measurements, so we can check and adjust accordingly.
I love garment measurements, provided they are accurate. Over the years you can accumulate a good understanding of how much ease you prefer at each measuring point for each garment style in each fabric. Saves on all those multiple size orders, trips with return parcels, and waiting for refunds. Plus very helpful understanding to have if you ever make your own.
Of course if the garment measurements Toast are giving don't match the garments Toast are sending, then we are screwed, and I will no doubt be back with a colourful diatribe ... but it's too soon to tell.
It is weird that Toast haven't made a bigger thing of introducing them, or even told us at all! It does make me wonder if they're doing it properly. Or it could just be Toast valuing the wrong thing, thus faux artisan/sustainable/community marketing bollocks, instead of highlighting a change which demonstrates actual thought, care and understanding.
Fingers crossed for accuracy!