There are many ways to do this, but I’m going to list the most cost effective solutions. I would look at some more pictures from the film to get an idea.
His pants are very specific and have a seam on the front and back, they also have no pockets. For you, I would just get chocolate/brown colored pants, mine are made by Dockers but any dark brown khakis will do.
For the yellow stripe, go to a fabric store and get a 7/8” yellow grosgrain ribbon and put sharpie lines on it about 1/4” apart the whole way down, and then used double sided fabric tape to attach.
For the boots, he essentially wears equestrian horse riding boots; I used rubber riding boots that cost $30. For your budget, I would make boot covers to wear over top of your normal shoes to make them look like boots, you could do this with fake leather from the fabric store and hot glue...google “cosplay boot covers” and you’ll see what I’m talking about. The next option would be “rubber riding boots” found on eBay or poshmark, maybe even a thrift store as long as they are almost knee high.
The jacket is the toughest, but again, you might have to make some concessions based on your budget. The cheapest screen accurate jacket is like $50. You could also get away with any type of “harrington jacket”, I picked one up at old navy about a year ago...it’s not screen accurate but it’s the same vibe. A tactical black jacket, or even a north face style black jacket also has a similar vibe.
Look at some pictures of Han from ESB and look at jackets while you’re at the thrift store and you may find something close.