Target is fine, if their stuff fits you. It’ll hold up decently for yoga, maybe a little less so for running. Think of it like you’re buying pajamas and it might be a little easier.

For what it’s worth, I felt Very Unjudged when I went into an Under Armour store, of all places. Might be my local store, I don’t know, but perhaps worth a shot. (And I work out regularly but don’t give off an I Work Out vibe.)