I'm 6'3'' and very broad.
Reading between the lines - Hilleberg Tarra tent & Scarpa Manta GTX boots, both serious bits of kit for four season use and with a reasonable price tag, even for the second hand tent.
Look at Rab Latok Alpine overtrousers, mine are if anything a little bit long so should fit you fine. Jacket for winter walking is a Mountain Equipment Lhotse.
These might be overkill but on my last outing to the Yorkshire Dales and a whole day of walking in the rain they never let me down.
There are cheaper options that I'm sure will serve you well.
My requirements were specific - winter walking @ high level & overnight camping, proven named brands that were tried & tested, reliable & with plenty of venting, pit vents, 3/4 length zips/multiway for the over-trousers.
Deluge over-trousers are rated on here but may not be long enough. Mine weren't long enough and I had to wear them low, in foul weather they would eventually wet out, maybe to do with their age or just pushing them too hard.
There is a plethora of 2/3/4 season choices between the two.
On all choices made most of my enjoyment is in the working out what is best for me.
Gunwharfman has found a waterproof set up to suit himself, mine is from my perspective.
Good luck.