There's no pattern to the Securetech clothing.
I have tried and failed to find one.Here's the list of differences between standard and secure.
Secure Clothing: +2 conceal, -.5 kg, +1 avail, -50 nuyen, -.1 SI
Secure Jacket: +3 conceal, +1 kg, +1 avail, -50 nuyen, +.05 SI
Secure Vest: +3 conceal, -.25 kg, +1 avail, -25 nuyen, +.1 SI
Secure Ultra-Vest: +4 conceal, -1 ballistic, +.5 kg, -250 nuyen, -.1 SI
Secure Long Coat: +2 conceal, +1 kg, +1 avail, -50 nuyen, +.15 SI
I think the Secure Ultra Vest is meant to be like the armor vest with plates, so that's what I compared it to.