Here's my approach:
The biggest challenge will be the colorway (CW), which is seasonal as well. The H.com website have some accented with a more teal blue that might be interesting to you.
If you're set on royal blue, I'd start browsing vintage pieces to figure out which CWs suit what you're looking for, then refer back to that season's thread here to see which designs were produced. If there's no success that way, colors will get repeated in different CWs (albeit with occasional variation), so if you find a blue you like, but not CW, you can also search the color to see if it was released in a different CW in a different season. The color may vary a bit year to year though, but if say, bleu cobalt is the shade of blue you're looking for, that can be something to search as well.
More seasoned members can probably point you to specific CWs/seasons/designs, but I kind of enjoy the process, even if my wallet does not.