Glad it's not only me as it happens to me all the time. Everytime i take a lunch break to visit the dept stores, i get ask for assistance.
When i get asked do i work here?, i say no, so that's normally the end of the conversation.
Occasionally i just get asked with the assumption i already work there. ie where are the those items located?, how much is this?. Not being the type to refuse a request, i normally help out until i get ask questions are i cannot answer!!. You should see the surprise on their faces, when i tell them i don't work there, after helping them find items on shelves, and locating the price!!, it's funny.
Lastly, i have a few times responded that i don't work here, but they still want assistance. So you don't work here, but can you still help me?.
I've always wondered too, if i have the retail store look!, because i think i get singled out more than others.
Sometimes i think it's my clothing, business i wear a business shirt and tie etc, however even on weekends shopping i get asked. This is despite wearing casual clothing, sometimes with a hood, and wearing sandals, it's quite unbelievable.