For boots I would recommend crowprops.com and get a pair from Gio (aka Crow62). He is based in Ecuador and makes the best reproduction Jango boots. The turnaround time can be quite long, I waited 5 months for my order to be shipped but I know of others who have had theirs ship sooner.
I have no suggestions on a vest pattern as I bought my vest outright. A lot of mercs on the MMCC boards make their own vest so its possible there are some patterns floating around there.
As far as a vest pattern. Mandalorian Mercs has a pretty good tutorial for making your vest pattern Try to avoid using that "dart" cut out that they show. The seam from the "dart" will show between the armor plates. If you need to take in the waist or abs area try adjusting it at the side seams (my recommendation). This is what I used to make my patterns and then modified it as needed. It took me 3 tries before I was happy with the pattern.
If you need to take in Tutuapp9AppsShowBox the waist or abs area try adjusting it at the side seams (my recommendation). This is what I used to make my patterns and then modified it as needed. It took me 3 tries before I was happy with the pattern.