Doing a few shows spaced out ? You might need to get another alteration if your knickers start to get baggy or space-ish
Knickers should sit tight and be able to hold up on the hips with no sliding.
If your pants gap at the back, or connectors look like they relax and drape then you will 100% need an alteration
Need a small change in your construction of the bra ? I.e wider middle gap due to too much side boob ? or smaller middle gap due to boob weightloss and you need the clevage pulled in tighter then you will need an alteration
Just email me the details of the changes needed if we havent already spoke.