I did a feature where the main actress wore the same tube top and mini skirt for almost the entire movie, and many scenes were shot very wide. I explained the problem to the director and it was agreed that the character would wear her over the shoulder bag as often as possible, which it turned out worked well with her character. The Tx hid in the bag, cable taped under the strap.
For shots where she had to take the bag off, or if it didn't make sense for it to be on, I'd work out where the pack could go. If I could get away with the small of the back or brastrap I would, but a few times it had to be inside the miniskirt, antenna down, and even then I had to tape the antenna over so it wouldn't show.
The actress didn't enjoy it, but she saw that I only asked if there was no option, and she was very helpful.