It's not easy. Getting the tag integrated into the clothing enough so that it will fail when tampered but not fail under normal flexing of the garment is difficult. We've tried a lot of options. To get a tamper tag that can then also be washed is even more difficult.
There's two options.
A completely custom made unit which like the security tag in clothing stores goes through the clothing and an attempt to remove breaks the antenna or the tamper loop. We have done this once and the costs are substantial - custom plastic housing custom antenna design but the concept works.
If the tag can stay dry for example liner of a designer handbag then we have a peel tamper tag with a very sticky adhesive back. This is strong enough to provide a good bond to fabrics and then allow for a break when an attempt is made to remove.
Seritag - 10 Mar 2023