School uniform - secondary. How much do you size up?

[YgritteSnow]

I know it's boring but 🤷🏼‍♀️

Dd just fits into her uniform - slightly too tight. She was in it for two years - 34 inch for everything - blazer, pullover etc. Skirt 28 inch waist 20 inch length. It was too big when new but not ridiculously so and she got two years out of it. Do I just go up to 36 or take the big jump up to 38 (worried she'll be swamped) but would be great if she got another two years but I also feel like she's going to shoot up, she's already slightly taller than me - just over 5'5 She's going into year 9.

What did you do mums of secondary girls? Thanks

I sized up & bought my dd a 34’ uniform when she began secondary. She was still in it 5 years later. It’s impossible to know what size they are going to end up.