Outfit style is not the same thing as crafting style (book/motifs + material). There are no boss/delve quests in Coldharbour, so it can be done that way, but:
- new content usually brings new crafting styles (a Cadwell-centric new thing - zone or trial/dungeon - makes no sense);
- there will be a conflict between the Cadwell styles (outfit and crafting).
All you can do for now is watch for the events that will make the Cadwell outfit style available.
See a seasonal crafting/outfit exclusive to CS? Buy it immediately. Tsaesci, Harlequin and Cadwell's are one of the most quality made styles and they have reasonable cost.
Weapons style pages were available at the event, the armor style pages was available in the crown store.
And yes to be able to craft it for another, would be great!