I noticed when I was looking through the code to change the translation files to show the stats in equipment, items, and states descriptions rather than just mentioned of increases or decreases, that I believe the Survival set seems to have some oddities.
Each part claims in their description to give an increase in DEF, SPD, SUR and SCU in exchange for decreased Sexy and Weak; except for the bottom which increases Sexy and doesn't change Weak. However the code for the parts stats is a little all over the place and kinda counter act each other in terms of speed wise as well as some other small weird stat choices.
The Jacket(SurMid) takes away 0.05 speed and only takes away -5 Sexy compared to the Shawl's(SurTop) -10 Sexy which only covers "Back" compared to Jacket's entire torso both graphic and code-wise; I think these might make more sense having their Sexy swapped with one another at the very least and the speed might just be a simple mistake of putting a - rather than a +.
The Sash(SurMidExtra) gives 0.05 AND takes away 0.1 speed; this might be leftover from copy pasting code from another outfit as a base since I noticed some clothes have a hidden from their description negative speed stat ex. most of the Adventure parts have -0.1 each, except the Cape.
Boots(SurBot) gives an increase of 0.1 speed but only increases SUR by 2 unlike other parts giving 3; this might be intended balance it's just a bit weird it's the only part that does it.
In terms of the speed issue:
These two null each other
Jacket: +0.05
Shawl: -0.05
These two mostly counteract each other.
Boots: +0.1
Sash: +0.05 and -0.1
From the whole set you only get a total of: +0.05 speed
The 0.4 SCU boost is uniform across all the pieces so that seems fine. The only other stat oddity may be the Shawl having 3 DEF rather than 2 like the Boots due to covering less than say the Jacket or something but that's more or less a suggestion at this point.
Also kinda weird that the Shawl and Jacket are called Leather and the Boots and Sash are called Hunter indicating they could be separate sets; might just be due to the English translation.