I fully understand and support the need to curb excessive returns. I work in an office with just over 100 people. Almost every Monday morning there is a fairly big stack of outbound Amazon or other online shopping returns. When I ask coworkers it is usually things like that wasn't the shade of red I wanted or the sleeves/legs are too long, or this brand of shoes doesn't fit right in my size or I guess my kid had a growth spurt ... etc. Rarely is it because it was a completely wrong item.
The stores I have seen have towers up front. If you choose an off peak time -- not 5 p.m. on Friday, it is an easy process. Even when picking up a TV I was in/out in under 10 minutes with associate bringing it from the back on a cart.
I think this works for specialty and upscale retailers with limited or no retail buildings like Orvis, L.L.Bean, etc. It would expand on their Chat function. Representatives will need to be VERY knowledgeable on products. Risk could be that shoppers use it as a vehicle to complain (to be heard) or return merchandise which could lead to needing even more specialized customer service staff.