Ghillie suits should take up less space, so you can keep it in your inventory then stash your backpack somewhere and change to ghillie gear when you want to use it. Theoretically if rolled up it shouldn't take up so much space anyway.

I guess you sortof can but the ghillie suits and headwear takes up so much inventory space it's not really worth it.

Suggestion:
Hood 1x2 2
Bushrag 2x3 6
Top 2x4 8
Full Suit 3x4 12

This way the ghillie top and hood take up 10 slots, still quite alot. The full ghillie suit and hood would take up 14 slots. So you sacrifce alot of space by carrying them around but not so much as to make you choose between having a backpack or having a ghillie suit.

For example the SPOSN has 28 slots, so having the full ghillie suit would take up half of your backpack space. Currently it would take up a whopping 24 slots, almost an entire backpack.