Despite the practical health warnings and drinking water provided in city centres, nobody had warned visitors what not to wear. Or that their outfits might melt.
Kilcullen said that the heat caused her travel companions to perspire so much that their costume jewellery tarnished and turned green.
“We had green dripping necks,” explained the TikToker.
“It was disgusting and we looked like Shrek.”
The video, which has racked up more than 6 million views, shared additional wardrobe problems.
Heat was a big issue, meaning many of the clothes she packed were useless. Her other top tip for coping in the heatwave was to avoid long trousers, saying even linen coverings were too hot.
“Don’t bother with pants, you’ll drop dead,” she concluded.
Beyond the heat she complained that many of her outfits made her feel out of place and instantly recognisable as a tourist.
What she referred to as the “classic going out outfit in America” and “workout wear” was a mark for those who might take advantage of naive travellers.
“You’ll stick out like a sore thumb and get over-charged,” she said.
Kilcullen had a wardrobe disaster, even coming close to breaking a heel on cobblestones.
However the main takeaway from the Roman sojourn was how the incredible heat had coloured her green.
The green marks - from a combination of sweat, copper jewellery and sunscreen - was something that many of the comments recognised.
While some advised her to coat her necklace in clear nail polish, it’s something Kilcullen said she’d avoid next time.
“Do yourself a favour: only wear your real jewellery,” she advised
