Fuss about nothing in my opinion, doesn't bother me what people wear when shopping! I personally wouldn't go outdoors, other than to put the bin out when I forget, in my dressing gown but I often wear nightwear until late afternoon if I'm doing housework or just lazing around. And I often stay in bed until lunchtime reading or playing on my iPad - why not? I'm not harming anyone.
And, shock horror, I don't have a shower every day, there's no need as I don't have a manual job, don't get sweaty, wash my hands regularly and don't smell! Years ago no one bathed daily.
I'm more likely to look away if I see someone wearing swimwear when shopping as seen on holiday, fat and sweaty bodies do not appeal to me!
Is there any need to be so sanctimonious or self-righteous? Wearing pyjamas/leasure wear outdoors is not an indication of the downfall of society!