Who uses a tuckable holster? Which one and why? I am worried about any with big a belt clip, then you have to conceal the belt clip. This would be for days I have to wear dress clothes. I have been putting in my lap top bag on those days, just makes it hard to get too.
TIA!

I started with a soft holster that didn't keep the pistol safe and secure. My trainer recommended Kydex which I now use. It keeps the pistol secure and doesn't move. The Kydex is not irritating next to your skin and I can drive my car with it tucked in front. Unless you plan on the old school shoulder harness under your arm, I highly recommend a belt clip, otherwise you will be adjusting it all day and defeats the conceal carry function.

Like everything it requires getting used to it and training. I take mine to the range. My trainer give us drills to practice real life scenarios.

I use Concealment Express IWB but many Kydex holsters are about the same.

If you carry AIWB, check out Phlster's new enigma,
It works completely independent of a belt or pants
in conjunction with a good winged AIWB holster.
Availability is spotty, I got mine Saturday and put it
together with a JMCK 2.0
I got it for similar rare occasions as yours.

Milt sparks vm2 with tuckable clips the clips go behind the belt on the pants secure and hidden

I've used CompTac CTACs for years and they are extremely versatile, and tuckable. 2 small clips and, in my experience, gun disappears.

This is a IWB, not AIWB option though.

Anything TENICOR with the DCC clips.

DCC clips are the ticket, low profile, strong and will keep your holster stable with the only downside is one has to be careful when clipping onto or removing from your belt as they might bite your leather belt.