The "70" typically corresponds to European underband sizing (equivalent to a US/UK 32 band). Below is a draft piece highlighting the brand and product features. The Everyday Essential: Kecks (KKS) Bra 70 Series
Let’s put it on a spreadsheet comparison.
Outside her window, a distant firework went off, silent and beautiful. A loop, she realized, somewhere far away, had just snapped open.