Secret Service may not be around, but it's our duty weapon (228/229) as well. I wear this weapon concealed for both duty and off duty carry. I've used a variety of holsters
ETA: The photos show different pistols, but these holsters are made for 228/229 as well.
This was my issued holster, but I wanted better retention:
I bought and use this one currently for duty use:
I have used this one for off duty carry (conceals better than the 2 above)
I ride in vehicles alot wearing a suit, have used this one and been pleased, (but I prefer a belt rig)
When off duty, I occasionally carry IWB but I can't find the holster anymore, it may have been discontinued. It was made by Safariland and was similar to this one without the thumbbreak.
I found the 228 a bit large for IWB carry, so when I carry IWB i carry a P239 instead. Hope that was helpful.