Boots:
When it comes to boots IMO a good logger style with a heel is awesome, as when you climb it is nice to have something to push against going up knowing you are solid on the rung. I always would rest on the ridge when working, made it so I could just place my foot and work. I don't have the steel shank like the lineman style has, the hard rubber vibram sole was fine for my feet.
As for brand, after I bought my red wings, I will never own another pair of work boots. Free laces and oiling for life at their stores, usually just drop them off when I know we are going to be out for a bit and pick them up same day or next. I opt to have them dip the toe in the plastic/rubber whatever it is, easily the most comfy steel toes I have ever owned. Two pairs lasted 10yrs, first pair fell apart after some galvanizing paint dried out the leather, and solidified in the lace eyelets (my fault for not taking them in though guy said they could have cleaned them up). Still have my last set and wear them more often than I thought I would after getting out of construction.
Gloves:
I just use the 3pack at Costco Wells Lamont leather glove, buy them tighter fit and they stretch a little for a nice fit, and can still feel somewhat small items. Still buy the same pack as they are cheap and last. Some wore the mechanix style, some with the plastic gaurds, really if you have a pair you wear often and feel comfy they will probably be fine. Just something to lessen slicing your hand/finger on some metal edges that were not cleaned up, hot steel in the summer, and bird poop..... lots of bird poop. I prefer leather for tagging and hoisting, probably due to the fact that those were what was supplied by one employer, and I got used to them.
Pants:
Lot of guys would wear blue jeans, I highly suggest a thick canvas double knee style, I always bought Carhart, they lasted longer than wrangler and Dickies for me across all trades. They are heavy duty, don't breath well, + in the winter - in the summer, but worth it IMO.
Rain Gear:
You'll want a nice water proof jacket, there are some heavy duty ones that you can put on over your harness, I prefer close fit, easy for me to move in. By close fit I mean; for comfort I wear XXL, but for work I would Opt for XL, kept the baggy loose crap out of the way.
Just remember, your employer is supposed to provide PPE per OSHA. Usually they skimp and go cheap, I made a deal with mine that if they bought me a harness I liked, I would buy the rest of my crap. Win win, I got a nice harness with a seat, and did not have to wear the crap they considered PPE.
The harnesses with the seat built in will be what you want, I think they are pretty well industry standard now though from talking with a buddy of mine. Cheap enough most employers will buy them for you, if not I suggest saving up for something like this
3M DBI-SALA 1113191 ExoFit NEX Tower Climbing Vest-Style Full Body Harness, Medium - Fall Arrest Safety Harnesses - Amazon.com
www.amazon.com
If they don't supply stuff, let me know I have some Y lanyards that are good and just taking up space, and a harness (no seat).
Though I think OSHA has a 2 year standard on all fall prevention equipment.
Also an OSHA20 I think is required, but that has to be paid for by your employer as well.
You will probably end up wanting a good bucket bag, (OSHA requires it be rated for weight) I used Klein for bucket bag and my tool pouch.
Extra Carabiners, need to be 28kN iirc, can get those at most anywhere that sells climbing gear, and we used to hit those stores for odds and ends to make slings for drills and tools.
All this you will find with time what you want like, finding out the cheap stuff that works and what does not just takes trial and error.