And don't forget the waterproof boot covers that go over your regular boots and up your ankles...
Do you mean gaiters? I haven't ever used them, but have thought about getting them - although, given the choice, I prefer not to walk in the rain if I can avoid it.
Places to buy gear here in the UK (unfortunately, it won't be cheap unless you catch a clearance sale or something):
Millets
Blacks
North Face
Cotswold Outdoors
Nevisport
Rohan
(There might be others I haven't heard of - we have all the above in Leeds.) These are all chain stores and have websites, AFAIK! I would not buy boots via mail order myself - I have to try them on.
Also, if you're in an especially outdoorsy area, like the Lake District, for instance - there'll generally be other more indie, specialist shops for it, like we have one here in Leeds called Path & Peak, for instance.
You might find other shops on the continent. We bought one pair of my walking boots in Paris at a fab shop called Au Vieux Campeur (the old camper!).
I have to have walking boots for the ankle support, and also I think my feet would end up looking like hamburger if I only wore my trainers. But that's me. DH also wears boots. I have one heavier-duty pair of boots & the ones I bought in Paris are more lightweight, trainer-like but still boots with ankle support. I've known people who walk with something as little as trainers or even those Teva sandals - including my MIL, against better judgement in her case as she is prone to breaking her wrists & ankles.
But hot climates (such as when they are in Cyprus) might dictate that. It never really gets hot enough here for me to worry about having to wear hiking sandals.
My main boots are
Trezetas and I'm not sure what the lightweight pair are - we bought them in France. Steve's newish boots are
Brashers - they weren't cheap, but it was a splurge from me for his Christmas present just past. The boots he had before that were a Coleman brand - they lasted him for about 10 years! My main thing is if you're going to pay the money for boots - make sure you get a good pair that are well and truly waterproof and a reputable brand - they should last you a long time, so it's worth it in the long run. If you're walking around with wet feet, you won't be a happy rambler. I'm going to be shopping for some new boots myself to go a size up as I mentioned earlier in the thread.
I do wear the hiking socks - heavier ones in the winter, lighter weight ones in the summer. (I also wear my hiking socks around the house just to keep my feet warm in winter, rather than slippers. Hiking socks launder easily & don't end up getting smelly like house slippers.) Although I heard something recently about if you want to avoid blisters (which I usually seem to end up with at least one), wear the socks that wick sweat away from your feet - because it's the moisture plus friction that causes the blisters. Not sure if I entirely 100% believe that, but I have some socks I bought once for the gym that I'm going to try with my boots.
I don't recommend Peter Storm brand anything - it tends to be cheaper and there's a reason that it's cheaper, because it's crap. Maybe a T-shirt or fleece from them is okay, but don't get any of their stuff purported to be waterproof and expect it to keep you dry.
I can talk a little more about gear if people want (or maps & walks books etc), but I really ought to get myself in gear & put all this info together for a 'Just Do It' topic - as it's been requested before.
As a woman of size, I had to buy my waterproofs from the USA (from Cabelas) because I couldn't find
good waterproof gear (i.e., not Peter Storm brand) available in my size sold here in the UK.