Def. check out Indygear.
With regard to fedoras, tor the best customer service and amazing products, seek John Penman, aka member BendingOak here.
For a great grail diary, PM Sarednab.
Never even seen any of the pricier fedoras (I understand several of the COW members are quite talented makers themselves!), but on the recommendation of board members there, I purchased an Akubra Federation IV (from Australia), which is - or was - their newest Indy-style fedora. $140 shipped, and it's a heck of a hat. I love it. If you're low on funds, this is a "compromise" that IMO is no compromise.
My jacket came from US Wings, which offers a discount to COW members on certain (pricier) versions. Mine was just the plain old cowhide version, and like the hat, I love it. $300 or so, shipped - I use it as a real, walking-around jacket in spring and fall. Too warm for summer, not warm enough for winter.
I do not have an authentic whip yet, and it will be quite a while before I do, if ever. IIRC, it came from MAC Whips, on eBay, a few years back, and cost a whopping $25:$. My bag came from Costume Base, and looks decent - I added the leather strap from Todd's, don't remember how much that was but it wasn't much and looks much better than the stock strap. I don't have an idol, which is probably the next piece I want. It'd be nice to have one I could cart around in the bag when I'm wearing the Indy costume.