Open Carry

This is probably not the ideal way to OC.  Not that you don't have a right to, it's just a little difficult for weapon retention to combine a IWB holster with a less than perfect belt situation in exposed in a difficult to retain manner. 

You're in the frozen food section, a cover garment wouldn't be too hot.

I wouldn't, personally, OC like this unless I was only around friends.  For this wardrobe choice, a shoulder rig might be what I'd choose.