Buying clothes on the internet is definitely sub-optimal.
I always assume I'm being watched in the dressing rooms, so I try to be discrete about unholstering and placing my weapon quickly under removed clothing or under the clothes I'm planning to try on. In the 17+ years I've been carrying I can remember only once being followed around the store after trying on clothes. That may have been because someone saw my gun in the dressing room, or just as likely, the plainclothes security guy just saw something suspicious about me and followed me for a while. Kohls

Here's the bottom line.... If you are legally carrying, in possession of your CHL and DL, try not to worry about it. 2 out of every 50 people in TX have a TX CHL, it's not new news for the store. Be discrete. If you are ever questioned, be polite and as honest as the situation warrants**. Leave if asked. If someone threatens to call 911 say "ok, that's no problem if you feel you need to do that". You're not doing anything wrong, so, don't be defensive. No need. Be prepared to be inconvenienced if things go a little sideways, but, they rarely do. Remain calm and polite. It's not personal.
** if a store security guard ever asks me if I'm armed I plan to politely reply with "Are you a police officer?".
If they answer yes, I'll ask to see credentials and if provided, I'll reply honestly.
If they are not LE, I would simply say "No". I feel no obligation to give a truthful answer to that question unless it's being asked by LE. If they've seen my gun on a dressing room camera, they already know the answer, so, whatever comes next will come next regardless. Be polite, stay calm and know you're not breaking any laws.
Just my opinion. I am not a lawyer. This is not legal advice.