Reddit mentions of Bass Men's Logan Loafers Burgundy

None of those. Ugly contrast stitching on all of them

Go for a classic

Well you're going to have to thrift much of this outfit most likely. Grey dress pants are all over the racks at most thrift stores. Just find something that fits you in the waist and is 100% wool, a wool/silk blend, or a wool/linen blend. Should cost you 15 bucks max. Take them to a tailor to have them hemmed and probably slimmed and tapered as most are going to be very baggy. Those alterations will probably cost around 30 bucks. Grab a slim dress shirt from Uniqlo or Express; they're not good quality but they'll get you through this wedding a few more events. A casual knit tie from tie bar will run you $15 bucks. I would grab a belt from Costco; I think they're about 15 bucks and they're full grain leather. Men's Wearhouse also sells inexpensive full grain leather belts for pretty cheap as well. You can pick up a pair of Bass Weejuns loafers for $50-$75 at many stores; just make sure you get the ones with leather soles.

You should really also have a jacket, even if you take it off immediately after the ceremony. That's another $10-$15 thrift item. Just about anything not grey would do fine. Even old jackets with very wide lapels don't look bad as long as the gorges aren't too low.

Substitute any of the new stuff I listed with thrift store pickups if you happen to come across them.

That should get you in the ballpark of $150