The bottom of hard sand provides firm footing, with no boggy mud, nasty reef, or stringy grass to fight. Ankle support is nil but, to repeat, the hard sand bottom typical of the Gulf minimizes the need for protection. Also a thought, a big stingray will get you, regardless. The Velcro-strapped sport sandals are marginally better than nothing but too loose and awkward for serious duty. Again, you might as well do it right and purchase equipment intended for the job.
Kits are available at all saltwater-oriented tackle shops.
The pliers are essential for unhooking fish and repositioning bent hooks. The belt also sports a metal clip for pinning a heavy cord stringer. On that note, the salty wader will not use a non-slip knot to tie the stringer to his belt. You want to be able to unload the entire cord and make a discreet exit if something more than 5 or 6 feet in length shows up. The cord stringer also can be used to tow a life ring or a bait bucket.