I have a local tailor who I found through reviews and word of mouth. She does alterations and repairs for me. She re-made a peacoat for me and did a great job, but I'm not ready to trust her with a nice suit.

I have ties, shirts, and suits made to fit. The painful truth is that good suits are really expensive (like thousands), but they should last, so price per wear is what you want to consider. Back at the beginning I went to places like Styleforum and followed a number of menswear blogs and stuff to better understand what I wanted and the whole process and sought recommendations for tailors and menswear stores. Typically you're going to have to go to a big city to find really good tailored suit options. I might search a lot of pics online of mens fashion to find looks and fabrics I like and then bring them with to my consultation appointment. It helps give your guy an idea of where to start with you.

I usually do Propercloth for shirts. Decent and decently priced. Cheaper than the tailor shop. Be prepared for your first shirt(s) to need at least some tailoring if not a full remake.

Sam Hober for ties. An absolute bargain for what you get. Choose fabric, length, width, knot. Great silks. Made in Thailand.