I want to disagree.
I really did own UA stock for a brief period, and you can check the stock charts yourself. The movement of UA attire into discount stores in the US was seen by company analysts as a sign of the company's move from premium, high quality, technical clothing to being seen as part and parcel of a wider slump in athleisure clothing in general. While I realize discount store shell suits may be de rigeur on the streets of Manchester (or wherever your observations are taking place) amongst the hirsute classes, nonetheless, the movement of UA from being seen as a premium clothing brand to much of their attire being seen as more of a commodity has concerned everyone from analysts to Kevin Plank himself. However, those details are clearly not as telling or relevant to the discussion as your eagle eye while out perusing the streets.....And, for the record, that last comment was sly snidyness, but it was earned.
And, lest I forget to mention, I realize that the streets of Manchester (or Timbuktu, or wherever) are central to your economic thesis on the issue, but you might want to broaden your scope a tad, especially considering both brands (UA and NKE) are HQ'd in the USA (Maryland & Oregon, respectively) with the vast majority of sales revenues (99.5%?) being outside the confines of the Greater Manchester (or any other single metropolitan) area.
Now, do with that information what you will, but try not to piss on the messenger and the message when they are both accurate, even if facts are not your thing. UA is down from a high of $120 to $20, or 83%, while NKE is down from a high of $67 to $53, or 21%.
Have a lovely weekend!