Lock & Co. Hatters James Bond Trilby Hat
The hat that Sean Connery wears in the first James Bond movies is still available at the original store: Lock & Co. Hatters on St. James's Street in London. Ask for the Sandown model, a trilby type hat. Although the hat in film looks grey, the hat is actually brown.
If you're in London, make sure to visit the Lock & Co. shop: it's on St. James Street, the same street as Swaine Adeney Brigg (who still sells the Bond Attaché Case) and around the corner from Jermyn Street where you can find many Bond related stores, like Turnbull & Asser.