Good running kit lets you move, carry what you need and adapt to the conditions. Start with a short practical trial, not a long list of expensive accessories. Fit and pocket layout often matter more than a feature count.
Shorts, liners and support
Try shorts through the movements you expect to make. Check whether the waistband slips, the leg opening restricts movement or the liner presses on a seam. Put the phone in its intended pocket during the test; an empty pocket does not show how the garment behaves under load.
For a sports bra, follow the manufacturer's sizing method and assess the band, straps, cup coverage and comfort while moving. Labels such as “high impact” are not a guarantee of fit. Do not accept pain, breathing restriction or persistent rubbing as something you must tolerate. Pregnancy and postnatal running have additional considerations in the parent-running guide.
Test storage with your actual phone
A large phone plus its case can fit very differently from a manufacturer's bare-device measurement. Check the zipped opening, not just the pocket's dimensions. Test whether you can retrieve the phone while stopped and whether the fastening remains secure when you move.
An armband keeps the waist clear but may be awkward over layers. A belt spreads the load around the waist. Shorts pockets avoid another accessory but may have less room. For hydration belts, repeat the fit check with filled bottles and decide how you will clean them.
Small accessories solve specific problems
A headband can manage hair or sweat; check the pressure and whether it stays in place. Gloves should let you operate the controls you actually need, but stop before handling a phone. Polarised sunglasses and UV protection are different claims: check the manufacturer's stated UV protection rather than assuming one implies the other.
For hot-weather clothing and winter layers, choose according to conditions. No kit purchase makes unsafe weather suitable for a run.
Spend on the problem you have
Start with usable shoes, comfortable clothing and a way to carry essentials. Add equipment after identifying a specific issue during a short outing. This is a selection checklist, not a tested-product ranking or a list of currently available bargains.