Okay.
The jumpsuit can be sourced from eBay, most army surplus stores or the GBFans Store. If you’re going to use one of the first two options, the preferred make of jumpsuit is Nomex.
Currently the store is sold out of elbow pads, so you’ll have to see if you can find some similar ones on eBay. The elbow pads you’ll be wanting are white by default, so you’ll either have to dye or paint them grey. Finally the elbow pads have a black square on the stretchy band of the elbow pad, this could either be achieved by sewing some stretchy material to the band, or it can be achieved by paint.
The store is also sold out of connectors for the hose. There might be a seller in the Marketplace selling them, so you’ll need to start looking through the topics. As sellers often sell the hose with the connector, you should hopefully find the two items being sold in the same topic… however, it should be noted that the hoses on the uniform were clear in Ghostbusters II.
As for fobs, once again the store is sold out (the GBFans store doesn’t stock items on an ongoing basis, it’ll get a large order in and it’ll eventually be whittled down over time - restocks do happen, but aren’t guaranteed). There is a retailer by the name of TygerCheex who makes excellent belt fobs. You’ll want to drop him a line.
For the Ghostbusters II logo patch, we do have those in stock in the GBFans store. 
The store also has the white pistol belt in stock.
As for the nametag, there are a few retailers with products of varying quality. this topic should help you determine which nametag maker makes the nametag you’d be most happy to have on your jumpsuit - but remember, the fonts of the nametags were quite different between the first movie and the second.
For the gizmo, you’ll want to purchase Spongeface’s Belt Gizmo kit (although it should be noted that the main board is designed to recreate the Gizmo as it appeared in the first movie - if you want to have one that looks like one of the simplified, stunt-friendly versions… you’ll have to build it yourself as nobody mass produces these).
The store is sold out of Belt Gizmo holders, but you might be able to find one being offered for sale in the Marketplace. One such seller to ask would be momeraths24.
On occasion a LifeGuard II will pop up in the marketplace, but your best bet would be eBay.
For the Trap holster, you’ll definitely want to drop momeraths24 a line.
Beyond that, take a moment to study the uniforms in the Equipment reference section.