There are lots of fiddly details on the Solo costume...the belt is the hardest, as the cheapest alternative is the costumebase one that apparently is kinda poor and probably not something you'd ever want to wear again.
If I had to do SW on a tight budget, I'd definately go for dark clothes, get a robe from the halloween store, and a $10 lightsabre from target. Maybe repaint/weather the sabre to make it looks less like a toy. And for those that have them already, you could pop in the wild contact lenses and go for the Sith Anakin.