You will need this magnetic Hat Trim Base so that your Feather trims have something to attach to. It has been enclosed in a thin material so its easy to locate. Because some hats are made of quite thick materials a stronger magnet is required than those used on stockpins. If you have trouble losing the magnet from your stockpin, maybe one of these could be the answer as they are more visible when they are dropped.
For more information go to https://handsomehorse.com.au/mix-and-match-hat-trims/