My son carries a Diamondback DB9 in his right rear pocket under his wallet every day for the last two years. Just regular jeans for a 6'1 230# guy. It is the smallest 9mm I ever saw and it shoots great. Nice smooth trigger pull. It looks to be modeled loosely like a miniature Glock and is very reliable. Based on my sons experience at least 4 of his friends are now carrying the same gun the same way. No holster between the wallet and him.
Hickok45 does a nice review of it on youtube.
Picture borrowed from Google images.
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