Hi,
I wear all french lace,in an office environment,but go out to building sites sometimes and have to wear a hard hat.I don't think a lace piece will last well under a hard hat,considering you will be bending,using tools,sweating etc.
When i take the hard hat off,my piece is well and truly flattened down from the weight of the hard hat,and im not on the tools either.

Perhaps direct this question to John at toplace,to see what he can recommend.I think Pauls suggestion above to keep lace for when you are not at work,is a good one,and find a base that can stand some rough treatment when you are at work

Regards topcat