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The main modification to stuff the crotch so that it will not be mistaken as women panties.
The rest is routine like changing fabric and topstitching.
I also recommend adding brand graphic to the waistband. Many of the reference I saw have it.
Michael Adams
Allure Diffusion
GABU
あまくちザウルス
CEOofMommies
Garber09
heikitsune
The Hungarian Coverist
じゅねす
PeachBitch
夢叶羽どどどちゃん
Francis Photography - Nude & Erotic FineArt
Zaknafein
雌犬空間
Jrpencil
TheTCFSPateron
Alexandraus
U-4
Laxzone
Zeronid
axsens
ChiAi_
asagimadara1207
長友かぼちゃ
dwindrakk
MistRatsu
Resauvi
しゅまし
renoahemiru
chillsoul
Freehand Wasteland
トラっち
.50BMG
調四季
Leeewds
speegel
Anryms4c41
Hector Salas
Roly
Rainyr