You go to the supplier and you buy what feels right. The sizes that seemed to sell. The colours that customers asked about. This is how most boutique owners buy. It is also how most end up with a rack of things that do not move.
The feeling is based on real experience. But experience stored in memory compresses over time. You remember the things that surprised you. You forget the slow movers that sat for six months.
The accurate picture is in the sales data. How many of this item sold in the last 90 days. Which sizes moved and which did not. Which items have not sold a single unit since you bought them.
If you do not have that picture, you buy on instinct. And instinct costs money — tied up in stock that does not move.
There is a second cost that is harder to see. When you run out of the things that actually sell, customers leave and buy from someone else. The cost of being out of stock on the right things is as real as the cost of being overstocked on the wrong ones.
Stoka tracks every sale at the product level. You get a shopping list based on what is actually low. You walk into the supplier with a list instead of a feeling.
That is the difference between buying well and buying hopefully.