I’d use Thad in temperatures nearing zero.
It does depend on the make though. My old mare has one that weight which is Bucas. She’s not warm or cold in temperatures from about 8 degrees to minus temperatures.
It would depend on the horse and the weather but none of mine would ever need something that warm. I have a nice 250g rug that never gets used as they all over heat in it.
It does depend on where you are and the nature of the horse, some like to be warm others hate it. My fully clipped cob is one of those that does really feel the cold and he is in 350g at the moment. But the equally clipped Connie who doesn't like being warm is still in a 100g. Rugging is one of those difficult things for new owners. You develop a feel for it over time. Ask the old owner if the horse prefers to be rugged more or less. You can layer rugs - either by buying something that has liners so one rug covers everything, or by simply putting fleeces, quilts etc underneath. For a first horse you might be better off either with a liner system rug or with a 100g/250g and a decent fleece to start with. You can always buy more rugs!!
I would get a thinner rug and a liner. I would not use a fleece as they pull back and collect bedding. I have a Rhino turnout with detachable hood. It can be a normal thin rug or be a winter warmer rug with a hood. I would not buy one with hood attached as many horses lose their manes if they are too warm, so mine only wears a hood when it is cold and wet.
would depend entirely on the horse and how exposed the field is.
Mine generally doesn't wear more than 250g in cold weather unless it's blowing a gale or otherwise horrible weather. If she gets too hot she gets very uncomfortable. At the moment where I am it's very windy but out of the wind it's not too cold, so their normal MW rugs are plenty to keep the windchill off.
Again it totally depends. robin is high chaser clipped and in a 450grm. He wasnt warm enough in 300grm. you need to learn how to tell if a horse is warm enough and deal with the horse in front of you rather than what a forum might say.
It depends. For most of mine absolutely, for the current one, its about right. Is he hot or cold generally? By fully clipped is it legs and face off as well? Is the field sheltered or exposed? Are you haying in the field?
The answers to those questions will give you an indication, but its your horse so you know him/her best
I’ve got one fully clipped cob in 100g and s as mother in 50g that ones still got mane and legs which is poss why she’s warmer. It all depends on the horse.
Mine hasn’t been in anything over 100g so far, fully clipped ID.
I normally get the 200g out once we are in the new year and he’s had his last clip, but it has to be bitterly cold.
Best to get to know the horse - just put your hand under the blanket to see if she is too hot or too cold. I have 2, both of similar breeding, and at present 1 is wearing a 100g and the other a 300g with hood. The mare is just one of those who feels the cold and is miserable if she is not warm, while the gelding seems to have some very efficient internal radiator. Don't worry, as you get to know the horse you will figure it out, and if you find that you are lacking a heavier rug you can order quickly if you need it. Good luck!