Apparel sells on a calendar, not an open-ended funnel
Most sales software assumes a deal can close whenever the buyer is ready. Apparel does not work that way. A collection has a buying window, and when the window shuts the retailer's open-to-buy has been committed to somebody else. A lead that goes quiet in a normal business is delayed revenue. In apparel wholesale it is revenue that has already gone to another brand, and it will not come back until the next season.
Everything a brand needs from a CRM follows from that. The order book has to be visible while the window is open. Catalogue and sample follow-up has to be measured in days, not weeks. And the agent's diary has to stop being the only place the booking position exists.