Avoid "liquid glitter" cases which can leak or yellowed clear plastics. Stick to high-quality TPU or PC (Polycarbonate).
Places like eBay or specialized liquidators often have "New Old Stock" (NOS) of original Apple Leather or Silicone cases. These are the gold standard for fit, but be wary—silicone can get "sticky" and leather can dry out after a decade in a warehouse. buy iphone 7 plus case
Modern third-party charging cables can be bulky. Make sure the case cutout is wide enough to accommodate whatever cables you still have lying around. Avoid "liquid glitter" cases which can leak or