"of being a mermaid" was Jessica's answer. "Understood... this way please" the clerk joyfully responded before leading Jessica and Andrew to the correct area.
The area in question was not like either father or daughter had expected, the place was devoid of actual mermaid tails and instead flooded with various scaled-themed skirts and shorts on one side in the middle and otherwise filled with various kinds of swimsuit tops like seashell bras or scaled bikini or tankini tops.
"you sure this is the correct area?" Andrew questioned, "yes indeed... and I know your confused, which I personally blame on these options not being among the demonstration" the clerk assured, "Well... the tops I somewhat get... but what about the skirts and shorts?" Jessica inquired, "their the main mediums of merfolk transformations" the clerk answered.
Seeing Jessica and Andrew were still confused the clerk continued explaining "water acts as their activation in which they expand and envelop the wearer's legs and reform them into the tail while improving underwater eyesight and pressure endurance alongside giving the ability to breathe water", "so... it's to ensure users can walk even when...human" Andrew remarked, "yes exactly... and getting the tail dry reverts the process" the clerk agreed before saying "now the colour of the tails and fins match up to the colour of skirt of shorts... but be aware that nothing must be worn under them or on your legs when transforming as they will be irreversibly destroyed".
just then Jessica when and picked up a pair of the shorts "didn't you say you wanted to be a mermaid?" the clerk questioned in response, "yeah...why ask again?" Jessica returned, "skirts and shorts are gender-based... a male using a skirt will become a mermaid as opposed to a merboy or merman, and vice-versa" the clerk admitted, "oh lovely" Jessica complained as she switched the shorts for a colour-counterpart skirt. "the tops are added additions that are paid for separately and we link up during transactions, though one can have a tail without one even after linking if desired" the clerk then stated "once you've completed your selection, come with me to the checkout".
"based on the prices I say you can also get a tail dad" Jessica then suggested, "we'll see Jess... We'll see" Andrew responded.
A while later at the checkout "Alright... is that everything?" the clerk asked, "yes ma'm, that is all this time" Andrew answered, "so are you going to test your new tail ASAP or wait until the time is right?" the clerk then inquired...