She probably using the prostetic chest piece, like a lot of cosplayers do now a days..
Its normal for breast size to fluctuate a bit.. but not to several different sizes during a set xD
If you mean the "Access to Full Nude art of my cosplay."
Its drawings, not actual nudes which people seems to think for some reason, unless its changed now(which i doubt)
https://cyberdrop.me/a/sJyOkP0E
https://z.zz.fo/8WMAV.jpg
This is more or less her actual size.. tho who would know anymore, think all her sets the past year or 2 at least are just with the chest plate..