I don't know, I just can't see the clothes disappering as fanservice for some reason.
In stories like fairy tail, the loss of clothes was always emphasized as sexual by them going "oh no my clothes! Don't look perverts!" Or "stop flashing everybody you pervert!" you know?
But here it's more of how practically speaking, their clothes are not durable enough to withstand the things they go through rather than "look boobs are being revealed! OMG!!!" AND they all actually have underwear rather than going comando all the time AND said underwear is just that. Underwear.
Or maybe I'm just too dense ┑( ̄Д  ̄)┍
Nirei kun (≧∀≦)