Development is both complicated and simple. Mastering an unruly process with a lot of moving parts requires an easily understood (simple) approach that is focused, organized and flexible.
What are the design challenges that need to be solved? What's the process? How are modifications documented and followed up with? These are just a few questions that should be asked and answered at the outset of your project. You should have clearly defined deliverables that are relevant to you and what you're trying to achieve.
"This is industry standard" is typically arrogant jargon for "please don't question my approach"... dismissive bullshit from someone going through the motions that'll leave you with a mess of problems for someone else to fix.
That's not to say there aren't standards to follow. But, that's a starting point on your road to discovery of the best possible solutions for your product, not an excuse to do the bare minimum.
A one-size fits all, or, disorganized approach, unfortunately, is typical of what's being offered in the market. We see it every day. We inherit those projects all the time. Whomever is doing your development, even more than production, should be someone you can relate to, who understands what you're trying to achieve and is contributing to your project and furthering your goals.
Development done right™ isn't about making a pattern or fit sample. Those are deliverables within a larger mission. The point is to create a platform, on a style-by-style basis, for you to succeed. This is the process by which you discover the best way forward, given the nature of your product, your selling prices, cost targets, quantity and desired quality.
Development done right™ is meant to anticipate, given these parameters, potential production challenges. It's about discovering how to improve your chances of success, making decisions that will help you avoid problems while producing great product. If you wait until production to stumble into these things it's just costly. Time and money fly out the window. Quality development anticipates and plans for this.
Your deliverables should include approved fit samples and a fully vetted production-ready development package, a valuable asset for your business, that you own. You are ready to manufacture and have an asset moving forward that can be utilized as you expand your collection.