This is what happened when i wore the girdle with my shapeshifter

You stop using a sash of fine green silk.
You wear a girdle of giant strength about your waist.
Your muscles surge with the strength of a giant.

<957/72%hp 887/68%m 839/100%mv 24900tnl 1 AM> af
You are affected by:
Spell: 'giant strength' modifies strength by 4 for 36 hours.
Spell: 'haste' modifies dexterity by 4 for 16 hours.
Spell: 'fly' for 12 hours.
Spell: 'detect magic' for 11 hours.
Spell: 'detect invis' for 11 hours.
Spell: 'stone skin' modifies armor class by -40 for 8 hours.
Skill: 'poison' modifies strength by -5 for 8 hours.
Physical effect: 'weaken' modifies strength by -5 for 4 hours.
Spell: 'control translucence' for 4 hours.
Spell: 'pass door' for 3 hours.
Spell: 'giant strength' modifies strength by 5 for -1 hours.

affected by gs twice ...