As Salaamu alaikum wa rahmatullaah wa barakaatuh
Below, I am just sharing this letter that I had to recently send to a store that you may be able to use in shaa allaah if this happens to you:
Hello, I am a new customer of your market and became a member within the first week of shopping there as I have been in search of a new all natural/organic market. Needless to say by my frequent shopping, I am very pleased with your market and have not had any bad experiences there until today.
I am a very modest woman who observe my religion to the fullest and in doing so I wear the tradition dress/garments of a modest protected woman. I always welcome questions of my religion as it is my duty to invite, however I do not think it is of good etiquette of any of your employees to question on whether I am hot in my clothing in the summer or not. I found it to be very offensive and unnecessary as anyone with intellect knows that the summer brings heat for the lewd and modestly dressed individual.
Everyone from employees to even your customers have been very friendly with every one of my visits so far and I do not wish to have an experience as I mentioned above in your store in the future. I thank you for listening. I trust that this will be handled discreetly, however you may contact me if you need to.
My dear sisters, In sha Allaah this may be of some benefit to you to use as a possible template. You may arrange it to fit your situation.