HTV needs to be pressed with heat (140-160°C), so the material needs to be able to take this temperature.
HTV/ flock on textiles
There will be no issue with plant-base material:
Viscose (made from bamboo for example)
Jute / gunny
Mixed-material needs to be tested first:
Polycotton (avoid if more than 35% polyester)
Spandex / Lycra (avoid if over 5%)
Do not use synthetic of fragile fibers!
In case of doubt, look at the label: the iron needs 2 or 3 dots in it.
Some polyesters work fine...
What is he most adapted cut / style of clothing
Remember that clothing can be stretchy but HTV is not.
Loose styles are good as they will never stretch the print. You will have no issue with canvas-type fabric that are not stretchy either.
Knitted fabrics, like T-shirts, are a bit more complicated because ot tummy and boobs.
So choose fitted but not skin-tight.
Example: take the piece of clothing in the shop, put it over your breast. Without pulling on it it should reach your sides. If it doesn't, pull and see how much the printed-area is stretching.
Remember that it won't be able to stretch once HTV is set in one piece, meaning letters and lines could get deformed.
Then use commen-sense to make a decision.
Look at the label!!!
HTV / flock on leather
You saw my products, so you know it can be done!
The leather has to be natural (plain) or dyed.
Do not use on:
Patent leather (plastic shine)
Fake leather (PVC)
In case of doubt, try on a n on-visible area with the protection sheet (Teflon or baking paper)
I do not know everything, but if you try something and it works, please send me a picture on Facebook!