I'm a girl so answers suitably modified, but can answer for my husband as well I suppose!
We both do about 5 miles each way so mileage same as yours.
He rides in merino top pretty much year round (this one
here ) - in winter he also has a heavier weight one; and a jacket over the top (non cycling specific; from an outdoor shop). He doesn't actually have a proper waterproof jacket (he does have a paramo waterproof but we haven't actually tested it out on the bike). We both make sure to carry waterproof overtrousers on longer trips - he has the
Altura Nightvision ones and I have Altura something-elses; but they're both a bit short to be honest; if you're not careful thus funnelling water into your shoes! I find in winter that wearing boots solves that problem; in summer if it's hot I prefer to get wet than wear waterproofs (provided you're not in jeans or something else that'll just retain the water and make life uncomfortable). He rides in normal trousers/shorts; nothing cycling specific. I did get him padded shorts but he hasn't bonded with them... For me my 'bottoms' are nothing special, aside from my skort which I love but I think won't really do it for you
Pretty much year round I ride with an Altura Nightvision jacket - in winter it keeps the cold out to some degree (and with my double layered Merinos as in the previous link underneath, and my scarf, and my ski gloves, and my waterproof leather shoes with merino possum socks inside, I'm usually warm enough! - although the fingers/toes do still feel the nip); in summer it keeps the breeze off. This last week or two when it's been really sunny I've gone back to more 'normal' clothes and pedalled a bit slower.
I can't recommend merino highly enough though - not too hot, handles being wet better than cotton, doesn't smell...
Of course, if you're happy to pedal slowly and you don't sweat a lot (or have a huge hill or three) you can get away with non-cycle specific clothing, but then the waterproofs become a bit more essential. If you do sweat (Mr SHK sweats a lot) I recommend merino even more. I can't wear synthetics on my upper body next to my skin (even though I don't sweat much at all), they really do start to smell very quickly.
For shoes, be careful that the ones you cycle in have fair grip if you're not going clipless. My goretex waterproof 'trainers' are actually quite awful in terms of grip (in the wet); normal trainers are better, but some smart 'work' shoes would probably be bad as well.
EDIT: you'll also need a
buff and (to prevent helmet hair...) a
skullcap