AJ Group, the company that produces all the items with Opalo or Plavitex fabric, has been very kind with all the customization requests that I have presented to them. I have been able to get products with extra length on arms and feet as well as reflectors on items that usually don't have ones. Also colour changes have been possible to the standard items.
Cost of these kinds of customizations is usually 25 euros.
If you are interested in a customized product that I don't have on display, send me an email or use the contact form.