Jeans for skinny teenage boy

[AuldAlliance]

DS1 is 13 and a 5'8 beanpole.
He has some skinny jeans from Next with an adjustable elastic waist, which are great.
I've just ordered another pair and the cut is v different, so they bag round his thighs.
Where can I get a new pair?

We are in France, so it needs to be an international shop or one that ships here...
Any help gratefully received - it's quite tricky having a DS with just one pair of trousers that fit.
TIA

Massimo Dutti is good. If you are in the UK you can often pick up some absolute bargains at T K Maxx, perfect for skinny teen boys.

Got to H&M at 9:45 : it had been -3 earlier this morning, so the inhabitants of Provence were all shivering at home and the place was empty, even though it's the first weekend of the sales here.
Got 2 pairs of the superstretch skinny (14 yrs), which are perfect, and paid without queuing.

Thanks to all for your help!

ASOS tall range for my 15 year old, 6ft tall, 36inch leg giraffe

The only handy thing is that he isn't skinny as he's got a 32 inch waist, so clothes fit his nicely and don't hang off him

ASOS is AMAZING for this as can specify the waist and leg length and they have a good selection.