CiciTrends runs on three systems: your color season, the math of a wardrobe that works as a set, and fit. Every style guide on the site belongs to one of them.
Start with the system that matches the problem you have today. Each one has a formula you can apply before you spend anything.
Read them in order, or take the one that answers the question in front of you. Each system carries a formula, three key guides, and a tool that does the arithmetic for you.
Every guide carries a label: tested, sourced, derived, lived, or archive. No invented testing, no fake credentials, corrections in public. The method is published because the method is the product.