John Lewis have an own label brand of clothing – Kin that my wife describes as “Swedish Architect”. It’s pretty plain, nicely cut office-casual-neutral, there’s a whole range of jumpers shirts trousers jackets etc etc.The also have concessions in store for brands like Reiss, Hugo Boss and Ralph Lauren John Lewis men’s clothing ranges are directed at customers your age.
Gap are good for casual, as are Uniqlo, although the latter has stacks and stack of stuff, it is overwhelming, and you do need to go in with the thoughts that you are going to have to rummage and look past the “Young Persons” stuff that’s always at the front of the store and is always pushed heavily to attract the folks who shop the most. You will need to do more than a casual browse. All Saints also have a good range of tee shirts and jerseys – they are all logo’d though, although it is subtle. Next is also OK, but pretty cheap looking iMO. Ted Baker is good for suits and loud fun shirts. Avoid Marks and Spencer, clothes cut badly for the folks who have nothing left to live for.
Finally JP Maxx can sometimes be a gold mine, although same as Uniqlo you need to be prepared to rummage and it can be a waste of time, Really is a lottery that one