For our hot south Texas shorts and T-shirt weather, I tuck a Kahr P45 in a frontal deep concealment Thunderwear combo holster. For cross-country driving in slacks and sportshirt, I prefer to have my Bodyguard Airweight ready for action in a Bobby Mac EL-CID cross draw holster. Respective defensive loads are the high-velocity RBCD 45ACP 90 gr. TFSP (2036 fps/828 flbs), and the RBCD .38 Spl. 60 gr. TFSP (1705 fps/385 flbs).
I'd post pictures if only I could figure out how to upload 'em.