1. Watch hands, this is something we share with folks to watch when approached.
2. Where are your hands, in normal, everyday movements?
3. Where will your hands be, if matters get serious, including being on the ground, or at bad breath distance on knees, on your butt, or back against the wall?
Basically reverse yourself, and practice how you would take yourself down.
a.
Carton cutter (the one that takes a single edge razor blade) in shirt pocket, and if you wear a regular shirt , with tails, un-tucked, you can sew a "sleeve" for this to ride near the end of the tails.
[Which also keep wind from opening a cover shirt and exposing CCW.]
b.
Another trick is sew another shirt pocket inside a shirt, exactly behind the exterior pocket.
This is akin to surgical scrubs. One can conceal a carton cutter, various knives, also a small handgun.
c.
Take blue jeans, and where the inside seam is, again, add a sleeve, to hold a knife.
If you are sitting with legs crossed, the knife, or other items are accessible
d.
Inside hat bands of various hats, are another place to conceal.
For instance, one may remove their hat and have in hand when entering, or exiting certain settings, or in speaking with a lady, or respected "elder".
Some places still have a small "hat hook" under dining tables, so it is natural for one to reach for a hat.
i.e. outside Cafe, approached, and "you are coming with me/us".
It is natural "allow me to grab my hat".
The hat is in hand, a natural movment.
Note, some criminals, in some countries do use a hat as a weapon. So watch hats.
One trick is to have fish hooks under the brim. They can snag a Victim, various ways and impeded their movement.
I am still a proponent of screwdrivers, from the small pocket size about the size of a ink pen, with pocket clip, to larger, in a back pocket. Also a pair of needle nose pliers.
This goes back before the UK and other places had knife laws. It has to do with blending in, giving perceptions, and how it looks to onlookers (witnesses) and court in the event something serious goes down.
e. Simple padlock, as one might lock up a bike, and this allows more distance from attackers.
f. Swiss Army Knife with corkscrew. Spartan, is a good one, as is the Waiter.
This one can be in coat/jacket pocket, apron , etc. The corkscrew can be opened with one hand, and since the corkscrew opens perpendicular to handle, one has a "T" handle.
In other words, the tool is in hand , concealed, if a situation should arise.
g. Newspaper knife.
My lessons had this variation.
We used small penknives, non locking, Such as Case Peanut.
One lesson was sitting on a bus/streetcar , with leg crossed. Now Mentor forced down my leg, with small fixed blade in jeans legs. So I could not access that tool.
So in getting up, he turned, and I still sitting, had access to his Sciatic nerve, allowing me to run to back exit and evade.
The blade of a pen knife is thin, sharp, and will cut deep. The "newspaper" adds another fail safe of the blade not closing on fingers. The first fail safe, is how the knife is used.
I am sorry I do not know your laws and customs. None of my business. Still my lessons go back decades, and we kept it to the most basic level. We did not have that many locking knives, and none with pocket clips.
Now, with many restrictive knife laws, all these old school lessons, come into play again.
Restrictions today of total length of knife closed, length of blade, locking, and one hand assist.
Another great tool in the tool box beside a Case Peanut, or Vic SAK Spartan, is the Pocket Pal.
Inexpensive, legal, comes sharp out of the box, and is people friendly.
Sending best...