Why are running clothes so impractical?

Get a running belt. I've got a Flipbelt but there are lots out there. Basically a close-fitting stretchy fabric tube with slits to tuck your phone, keys, tissues in. Mine's got a small clip in it to secure keys to just to be on the safe side. Best bit of running kit I've bought.

If you decide sweaty betty via vinted or similar check on the pocket situation: older versions don't all have all the pockets!

Mens t shirts tend to be big and long ( depending on boob situation ) . I buy mens hoodies to run in when weather is cold for this reason.

Seconding finding the right leggings. Decathalon have great pockets . Sweaty betty great but pricy.

I second decathlon. I have fab legging from there with a pocket big enough for keys and a phone. They also have enough elastic support to stop wobbly bits wobbling. These with a long t shirt I bought from amazon are my go to gear as a size 18 runner/walker..

Ronhill and Sweaty Betty both have tights with great pockets!

You can get running leggings with pockets.

Primark had a load a few months ago.

but if you don’t like leggings don’t run in them. You can get tracksuits in all different weights of fabrics.

I used what was basically a bum bag to hold my keys and tissues when I ran (now I swim)

I run very early in the morning so no-one can see me. (I shit you not.) But I also spend money on my running gear, particularly leggings. I buy sweaty betty (last for ages, buy once every 4 years or so, have pockets, comfortable and don't roll down; often on vinted) and they have pockets, and depending on the type of leggings, pockets on both sides (as well as a zippy pocket in the back of the waistband to put a key). I buy cheap running tops loads bigger than I need so they are both longer and looser than required and act as coveralls. Expensive running bras because I have massive boobs and this alone stopped me running for decades; now I have decent bras is no longer a problem. I then layer so I can shed as I run (and yes, tie round my waist). If you will be running in the dark on unlit roads (maybe even with no pavements) then consider getting lighter colours / items with reflective strips. Do not worry about what you look like. I promise you, no-one cares. If they look at you and think anything they will think that you are amazing, look at you go. (That's what I think when I see other runners, regardless of what they actually look like: getting up off the sofa is SUCH AN ACOMPLISHMENT and I genuinely think that whenever I see anyone out.)

You can definitely get running leggings with pockets - try decathlon. https://www.decathlon.co.uk/p/women-s-fitness-cardio-short-leggings-with-phone-pocket-black/330215/c382m8614953
A big T-shirt is fine to run in, or you can easily get much longer running vests. https://www.marksandspencer.com/zela-crew-neck-racer-back-longline-vest-top/p/clp23012840?intid=mobile_app_pdp_share

I know it’s trite, but literally no one cares what you look like. If you feel really uncomfortable in tighter clothes, you can run in joggers (but I wouldn’t, too flappy).

North face is fashion gear rather than running. Look at actual running brands - asics, brooks, inov8 etc