Good plan!
I have been trying to be more disciplined about how colors look on, when there is face-color involved--so, tops, dresses, jackets,scarves--because the variations in depth, clarity, muted, etc make a huge difference on me--becoming more medium-contrast and slightly muted (but not yet dusty!). And because I really prefer having that just-right color--That being apart from just what color--so berries, yes, but what exact shades? For some years I bought a lot of burgundy type items but many of them are much darker than is best on me now.
Sooo--that's why it can't just be, green or burgundy or eggplant.
Which is why online decisions are so difficult! In a store, it could be immediately obvious.
Now, perfect colors for me are more relevant for the more common items--tops and sweaters that tend to be pretty available from lots of makers--or the different colorways offered in one item, as your dress.-. A different issue is, the actual item, insofar as some items are HEWI-type in terms of fit and fabric and might be outfit-makers because of that, so, whilst one would not buy a "bad" color, one might buy a pretty-good color (as when something other than black appears) knowing from experience that there will not be many options. But even there I am trying to be more patient rather than stock my closet with nearly-right colors.
