Amazon elastic belts that are perfect for tucking in your sweaters! Explands from 24 to 47 inches and comes in a pack of four different colors. Yoga pants are also from Amazon and I sized up to M (I was on the cusp between S and M on their size chart). My tee is old from Old Navy, this years version doesn’t have the side slit and looks shorter but I linked it anyway.

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LELE LIFE 4 Pack Adjustable Stretch Belt, Invisible Belt with Flat Buckle, No Show Elastic belt f... | Amazon (US) Promover Women's Yoga Pants Bootcut with Pockets High Waist Bootleg Workout Pant for ... | Amazon (US)
Hanes Women's 10-Pack Pull On Closure Crew Socks | Amazon (US)
Luxe V-Neck T-Shirt for Women | Old Navy (CA)