>>2512065You can get most everything at a thrift store, or through cheap and solid brands like Columbia. Don't go splurging on high end brands just yet. You will probably have some of it already. For clothes for milder temps I would get
-thin synthetic cargo pants
-thin synthetic shorts, like running shorts
-thin synthetic longsleeve. Can be a button up with a collar or have a hood if you like those features
-merino wool blend long johns
-merino wool blend longsleeve
-fleece sweater, zip up or pullover depending on preference
-light down jacket (probably the most expensive thing on the list, but can find one pretty cheap these days)
-merino wool blend socks, at least 2 pairs
-wind shirt. Mountain Hardwear Kor Preshell is the OG and can always be found on sale somewhere
-trail running shoes. Or hiking boots. I have both but don't use the boots much anymore unless I'm going off trail
-rain poncho or rain jacket. Ponchos are cheaper and pack smaller, best choice for trails, jackets are better if you are going off trail.
-toque
-baseball hat
-buff
-gloves (depends on temperature and climate)
-rain pants (optional, but very useful if you end up needing them)
This is pretty much all I bring for clothes on 10 night hiking trips and canoeing trips in northern Ontario in the spring, temps between 0 and 17°C
All the synthetics are because they are cheap, dry fast, breathe well, and block the sun well.