A helmet that is the right size should feel snug all the way round with no single pressure point, and it should not shift when you turn your head firmly from side to side. A helmet that moves independently of your head on a shake test is not the right fit, regardless of what the size label says.
None of this needs to be bought at once. Building a complete kit over time, prioritising the areas most exposed in a typical fall, is a realistic way to get there.
The result takes longer to arrive than an off the shelf helmet, and that is by design. A made to order piece is fitted, finished and checked individually before it ships.
An open face helmet leaves the face exposed, which some riders prefer for shorter journeys, city riding, or a more classic look on a café Heroine Racer or scrambler. It offers less coverage than a full face design, and riders who choose one should weigh that trade off honestly rather than assume it based on style.
Once the shell is formed and cured, it moves through finishing: sanding, painting or leather trimming, and fitting the internal padding and retention system. Every stage is checked before the next begins, since a fault caught early is far cheaper to fix than one found at the end.
Sun and heat are the two things to watch for. Leaving a helmet on a dashboard or in direct sun for long periods will dull and eventually crack leather trim, so a helmet bag or a shaded spot makes a real difference over the life of the helmet.